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tech:network:cisco:eigrp:eigrp:eigrp-basic:eigrp-basic

EIGRP Fundamental Configuration

EIGRP is Cisco proprietary routing protocol.

Almost labs are GNS3.

Metric

R1#sh interfaces gig0/1
GigabitEthernet0/1 is up, line protocol is up
  Hardware is iGbE, address is 0c22.be57.9101 (bia 0c22.be57.9101)
  Internet address is 192.168.1.1/24
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Unknown, Unknown, link type is auto, media type is RJ45
  output flow-control is unsupported, input flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:51, output 00:00:05, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     4 packets input, 240 bytes, 0 no buffer
     Received 4 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     10 packets output, 617 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#int gig0/1
R1(config-if)#de
R1(config-if)#del
R1(config-if)#delay ?
  <1-16777215>  Throughput delay (tens of microseconds)

R1(config-if)#delay 12
R1(config-if)#do sh int gig0/1 | i DLY
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 120 usec,
R1(config-if)#exit
R1(config)#rou
R1(config)#router
R1(config)#router eig
R1(config)#router eigrp ?
  <1-65535>  Autonomous System
  WORD       EIGRP Virtual-Instance Name

R1(config)#router eigrp 1
R1(config-router)#metric weights ?
  <0-8>  Type (Only TOS 0 supported)

R1(config-router)#metric weights 0 ?
  <0-255>  K1

R1(config-router)#metric weights 0 1 ?
  <0-255>  K2

R1(config-router)#metric weights 0 1 1 ?
  <0-255>  K3

R1(config-router)#metric weights 0 1 1 1 ?
  <0-255>  K4

R1(config-router)#metric weights 0 1 1 1 1 ?
  <0-255>  K5

R1(config-router)#metric weights 0 1 1 1 1 3 ?
  <cr>

R1(config-router)#metric weights 0 1 1 1 1 3
R1(config-router)#do sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=1, K3=1, K4=1, K5=3
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 1.1.1.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: internal 90 external 170

R1(config-router)#

bandwidth

this command only use for metric calculation. link speed is not take effect.

R1>en
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#int s0/0
               ^
% Invalid input detected at '^' marker.

R1(config)#int s0/1
                  ^
% Invalid input detected at '^' marker.

R1(config)#int s?
Serial

R1(config)#int s
R1(config)#int serial ?
  <0-0>  Serial interface number

R1(config)#int serial 0?
/

R1(config)#int serial 0/?
  <0-0>  Serial interface number

R1(config)#int serial 0/0?
.  /  :  <0-2>

R1(config)#int serial 0/0/?
  <0-0>  Serial interface number

R1(config)#int s0/0/0
R1(config-if)#ip addr 192.168.1.1 255.255.255.0
R1(config-if)#no shut
R1(config-if)#
*Oct  7 02:02:15.171: %LINK-3-UPDOWN: Interface Serial0/0/0, changed state to up
*Oct  7 02:02:16.171: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state to up
R1(config-if)#do sh int s0/0/0
Serial0/0/0 is up, line protocol is up
  Hardware is GT96K Serial
  Internet address is 192.168.1.1/24
  MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  CRC checking enabled
  Last input 00:00:01, output 00:00:02, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     4 packets input, 696 bytes, 0 no buffer
     Received 4 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     5 packets output, 720 bytes, 0 underruns
     0 output errors, 0 collisions, 6 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

R1(config-if)#bandwidth ?
  <1-10000000>   Bandwidth in kilobits
  inherit        Specify how bandwidth is inherited
  qos-reference  Reference bandwidth for QOS test
  receive        Specify receive-side bandwidth

R1(config-if)#bandwidth 128
R1(config-if)#do sh run
% Ambiguous command:  "do sh run"
R1(config-if)#do sh int s0/0/0
Serial0/0/0 is up, line protocol is up
  Hardware is GT96K Serial
  Internet address is 192.168.1.1/24
  MTU 1500 bytes, BW 128 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  CRC checking enabled
  Last input 00:00:00, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     8 packets input, 792 bytes, 0 no buffer
     Received 8 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     9 packets output, 816 bytes, 0 underruns
     0 output errors, 0 collisions, 6 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     2 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

R1(config-if)#^Z
R1#
*Oct  7 02:03:46.539: %SYS-5-CONFIG_I: Configured from console by console

Basic IP Configuration

  • R1
en
conf t
!
hostname R1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 192.168.0.1 255.255.255.0
no shut
exit
int gig0/1
ip address 192.168.1.1 255.255.255.0
no shut
exit
!
end
wr
  • R2
en
conf t
!
hostname R2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 192.168.1.2 255.255.255.0
no shut
exit
int gig0/1
ip address 192.168.2.2 255.255.255.0
no shut
exit
!
end
wr
  • R3
en
conf t
!
hostname R3
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 192.168.2.3 255.255.255.0
no shut
exit
int gig0/1
ip address 192.168.3.3 255.255.255.0
no shut
exit
!
end
wr
  • PC1
ip 192.168.0.101 255.255.255.0 192.168.0.1
save
  • PC2
ip 192.168.3.102 255.255.255.0 192.168.3.3
save

Basic EIGRP Configuration

  • R1
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 192.168.0.1 0.0.0.0
network 192.168.1.1 0.0.0.0
exit
!
end
  • R2
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 192.168.1.2 0.0.0.0
network 192.168.2.2 0.0.0.0
exit
!
end
  • R3
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 192.168.2.3 0.0.0.0
network 192.168.3.3 0.0.0.0
!
end
R1#sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 192.168.1.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    192.168.0.1/32
    192.168.1.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    192.168.1.2           90      00:00:47
  Distance: internal 90 external 170

R1#sh ip eig
R1#sh ip eigrp nei
R1#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   192.168.1.2             Gi0/1                    10 00:02:10    9   100  0  8
R1#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.0.0/24 is directly connected, GigabitEthernet0/0
L        192.168.0.1/32 is directly connected, GigabitEthernet0/0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0/24 is directly connected, GigabitEthernet0/1
L        192.168.1.1/32 is directly connected, GigabitEthernet0/1
D     192.168.2.0/24 [90/3072] via 192.168.1.2, 00:02:19, GigabitEthernet0/1
D     192.168.3.0/24 [90/3328] via 192.168.1.2, 00:01:49, GigabitEthernet0/1
R1#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

D     192.168.2.0/24 [90/3072] via 192.168.1.2, 00:03:44, GigabitEthernet0/1
D     192.168.3.0/24 [90/3328] via 192.168.1.2, 00:03:14, GigabitEthernet0/1
R1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(192.168.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.3.0/24, 1 successors, FD is 3328
        via 192.168.1.2 (3328/3072), GigabitEthernet0/1
P 192.168.2.0/24, 1 successors, FD is 3072
        via 192.168.1.2 (3072/2816), GigabitEthernet0/1
P 192.168.0.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 192.168.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
R2#sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 192.168.2.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    192.168.1.2/32
    192.168.2.2/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    192.168.1.1           90      00:00:55
    192.168.2.3           90      00:00:55
  Distance: internal 90 external 170

R2#sh ip eig
R2#sh ip eigrp neigh
R2#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
1   192.168.2.3             Gi0/1                    11 00:01:46    7   100  0  4
0   192.168.1.1             Gi0/0                    13 00:02:16 1021  5000  0  4
R2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

D     192.168.0.0/24 [90/3072] via 192.168.1.1, 00:02:37, GigabitEthernet0/0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0/24 is directly connected, GigabitEthernet0/0
L        192.168.1.2/32 is directly connected, GigabitEthernet0/0
      192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.2.0/24 is directly connected, GigabitEthernet0/1
L        192.168.2.2/32 is directly connected, GigabitEthernet0/1
D     192.168.3.0/24 [90/3072] via 192.168.2.3, 00:01:55, GigabitEthernet0/1
R2#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(192.168.2.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.3.0/24, 1 successors, FD is 3072
        via 192.168.2.3 (3072/2816), GigabitEthernet0/1
P 192.168.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 192.168.0.0/24, 1 successors, FD is 3072
        via 192.168.1.1 (3072/2816), GigabitEthernet0/0
P 192.168.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
R3#sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 192.168.3.3
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    192.168.2.3/32
    192.168.3.3/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    192.168.2.2           90      00:01:29
  Distance: internal 90 external 170

R3#sh ip eig
R3#sh ip eigrp nei
R3#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   192.168.2.2             Gi0/0                    12 00:01:52 1268  5000  0  7
R3#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

D     192.168.0.0/24 [90/3328] via 192.168.2.2, 00:02:10, GigabitEthernet0/0
D     192.168.1.0/24 [90/3072] via 192.168.2.2, 00:02:10, GigabitEthernet0/0
      192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.2.0/24 is directly connected, GigabitEthernet0/0
L        192.168.2.3/32 is directly connected, GigabitEthernet0/0
      192.168.3.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.3.0/24 is directly connected, GigabitEthernet0/1
L        192.168.3.3/32 is directly connected, GigabitEthernet0/1
R3#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(192.168.3.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.3.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 192.168.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 192.168.0.0/24, 1 successors, FD is 3328
        via 192.168.2.2 (3328/3072), GigabitEthernet0/0
P 192.168.1.0/24, 1 successors, FD is 3072
        via 192.168.2.2 (3072/2816), GigabitEthernet0/0
PC-1> ping 192.168.3.102
84 bytes from 192.168.3.102 icmp_seq=1 ttl=61 time=12.205 ms
84 bytes from 192.168.3.102 icmp_seq=2 ttl=61 time=4.416 ms
84 bytes from 192.168.3.102 icmp_seq=3 ttl=61 time=4.785 ms
84 bytes from 192.168.3.102 icmp_seq=4 ttl=61 time=3.918 ms
84 bytes from 192.168.3.102 icmp_seq=5 ttl=61 time=4.101 ms
D     192.168.3.0/24 [90/3328] via 192.168.1.2, 00:03:14, GigabitEthernet0/1
bandwidth = K1 * 10000/1000 * 256
delay =  K3 * 10 / 10 * 3 * 256
metric(Feasible Distance) = (10 + 3) * 256 = 13 * 256 = 3328

show commands

R1#sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 192.168.1.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    192.168.0.1/32
    192.168.1.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    192.168.1.2           90      02:05:03
  Distance: internal 90 external 170
R1#debug ip eigrp
EIGRP-IPv4 Route Event debugging is on
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#int gi0/1
R1(config-if)#shut
R1(config-if)#
*Oct  7 06:27:28.195: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.1.2 (GigabitEthernet0/1) is down: interface down
R1(config-if)#
*Oct  7 06:27:30.151: %LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to administratively down
*Oct  7 06:27:31.151: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down
R1(config-if)#
R1(config-if)#
R1(config-if)#
R1(config-if)#
R1(config-if)#
R1(config-if)#
R1(config-if)#no shut
R1(config-if)#^Z
R1#
*Oct  7 06:27:51.006: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up
*Oct  7 06:27:52.006: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
R1#
*Oct  7 06:27:52.245: %SYS-5-CONFIG_I: Configured from console by console
R1#
*Oct  7 06:27:55.588: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 192.168.1.2 (GigabitEthernet0/1) is up: new adjacency
R1#
*Oct  7 06:27:57.608: EIGRP-IPv4(1): Int 192.168.2.0/24 M 3072 - 1000000 20000000 SM 2816 - 2524971008 152
*Oct  7 06:27:57.609: EIGRP-IPv4(1): table(default): route installed for 192.168.2.0/24 (90/3072) origin(192.168.1.2)
*Oct  7 06:27:57.609: EIGRP-IPv4(1): Int 192.168.3.0/24 M 3328 - 1000000 30000000 SM 3072 - 754974720 305
*Oct  7 06:27:57.610: EIGRP-IPv4(1): table(default): route installed for 192.168.3.0/24 (90/3328) origin(192.168.1.2)
*Oct  7 06:27:57.615: EIGRP-IPv4(1): table(default): 192.168.0.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.616: EIGRP-IPv4(1): table(default): 192.168.1.0/24 - do advertise out GigabitEthernet0/1
R1#
*Oct  7 06:27:57.619: EIGRP-IPv4(1): table(default): 192.168.0.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.620: EIGRP-IPv4(1): table(default): 192.168.1.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.628: EIGRP-IPv4(1): table(default): 192.168.2.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.629: EIGRP-IPv4(1): table(default): 192.168.3.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.631: EIGRP-IPv4(1): table(default): 192.168.2.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.632: EIGRP-IPv4(1): table(default): 192.168.3.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.774: EIGRP-IPv4(1):
R1#table(default): 192.168.2.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.776: EIGRP-IPv4(1): table(default): 192.168.3.0/24 - do advertise out GigabitEthernet0/1
*Oct  7 06:27:57.787: EIGRP-IPv4(1): Int 192.168.0.0/24 M 72057594037927935 - 1000000 281474976710655 SM 72057594037927935 - 4294901760 4294967295
R1#unde
R1#undebug alll
              ^
% Invalid input detected at '^' marker.

R1#undebug all
All possible debugging has been turned off
R1#

maximum-paths

  • R1
en
conf t
!
hostname R1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.1.1 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.2.1 255.255.255.0
no shut
int gig0/2
ip address 172.16.3.1 255.255.255.0
no shut
int gig0/3
ip address 172.16.4.1 255.255.255.0
no shut
exit
!
end
wr
  • R2
en
conf t
!
hostname R2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.2.2 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.5.2 255.255.255.0
no shut
exit
!
end
wr
  • R3
en
conf t
!
hostname R3
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.3.3 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.5.3 255.255.255.0
no shut
exit
!
end
wr
  • R4
en
conf t
!
hostname R4
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.4.4 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.5.4 255.255.255.0
no shut
exit
!
end
wr
  • PC1
ip 172.16.1.101 255.255.255.0 172.16.1.1
save
  • PC2
ip 172.16.5.102 255.255.255.0 172.16.5.2
save
  • R1
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.1.1 0.0.0.0
network 172.16.2.1 0.0.0.0
network 172.16.3.1 0.0.0.0
network 172.16.4.1 0.0.0.0
exit
!
end
  • R2
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.2.2 0.0.0.0
network 172.16.5.2 0.0.0.0
exit
!
end
  • R3
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.3.3 0.0.0.0
network 172.16.5.3 0.0.0.0
!
end
  • R4
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.4.4 0.0.0.0
network 172.16.5.4 0.0.0.0
!
end
R1#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.4.4, 00:01:04, GigabitEthernet0/3
                       [90/3072] via 172.16.3.3, 00:01:04, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:01:04, GigabitEthernet0/1
R2#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
D        172.16.1.0/24 [90/3072] via 172.16.2.1, 00:01:08, GigabitEthernet0/0
D        172.16.3.0/24 [90/3072] via 172.16.5.3, 00:01:08, GigabitEthernet0/1
                       [90/3072] via 172.16.2.1, 00:01:08, GigabitEthernet0/0
D        172.16.4.0/24 [90/3072] via 172.16.5.4, 00:01:08, GigabitEthernet0/1
                       [90/3072] via 172.16.2.1, 00:01:08, GigabitEthernet0/0
R3#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
D        172.16.1.0/24 [90/3072] via 172.16.3.1, 00:01:08, GigabitEthernet0/0
D        172.16.2.0/24 [90/3072] via 172.16.5.2, 00:01:12, GigabitEthernet0/1
                       [90/3072] via 172.16.3.1, 00:01:12, GigabitEthernet0/0
D        172.16.4.0/24 [90/3072] via 172.16.5.4, 00:01:08, GigabitEthernet0/1
                       [90/3072] via 172.16.3.1, 00:01:08, GigabitEthernet0/0
R4#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
D        172.16.1.0/24 [90/3072] via 172.16.4.1, 00:01:09, GigabitEthernet0/0
D        172.16.2.0/24 [90/3072] via 172.16.5.2, 00:01:09, GigabitEthernet0/1
                       [90/3072] via 172.16.4.1, 00:01:09, GigabitEthernet0/0
D        172.16.3.0/24 [90/3072] via 172.16.5.3, 00:01:09, GigabitEthernet0/1
                       [90/3072] via 172.16.4.1, 00:01:09, GigabitEthernet0/0
PC-1> ping 172.16.5.102
172.16.5.102 icmp_seq=1 timeout
172.16.5.102 icmp_seq=2 timeout
84 bytes from 172.16.5.102 icmp_seq=3 ttl=62 time=4.698 ms
84 bytes from 172.16.5.102 icmp_seq=4 ttl=62 time=4.281 ms
84 bytes from 172.16.5.102 icmp_seq=5 ttl=62 time=3.606 ms

PC-1> ping 172.16.5.102
84 bytes from 172.16.5.102 icmp_seq=1 ttl=62 time=4.323 ms
84 bytes from 172.16.5.102 icmp_seq=2 ttl=62 time=3.804 ms
84 bytes from 172.16.5.102 icmp_seq=3 ttl=62 time=3.803 ms
84 bytes from 172.16.5.102 icmp_seq=4 ttl=62 time=7.646 ms
84 bytes from 172.16.5.102 icmp_seq=5 ttl=62 time=3.538 ms
R1#sh ip protocols | s eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.4.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#router eigrp 1
R1(config-router)#maximu
R1(config-router)#maximum-paths ?
  <1-32>  Number of paths

R1(config-router)#maximum-paths 2
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:00:33, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:00:33, GigabitEthernet0/1
R1(config-router)#
R1(config-router)#do sh ip proto | s eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.4.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 2
      Maximum hopcount 100
      Maximum metric variance 1
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.4.4, 00:00:06, GigabitEthernet0/3
                       [90/3072] via 172.16.3.3, 00:00:06, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:00:06, GigabitEthernet0/1
R1(config-router)#do sh ip proto | s eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.4.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1
R1(config-router)#no maximum-paths 2
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.4.4, 00:00:06, GigabitEthernet0/3
                       [90/3072] via 172.16.3.3, 00:00:06, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:00:06, GigabitEthernet0/1
R1(config-router)#do sh ip proto | s eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.4.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1
R1(config-router)#exit
R1(config)#int gig0/3
R1(config-if)#del
R1(config-if)#delay 10000
R1(config-if)#do sh int gig0/3
GigabitEthernet0/3 is up, line protocol is up
  Hardware is iGbE, address is 0ce3.ef42.9c03 (bia 0ce3.ef42.9c03)
  Internet address is 172.16.4.1/24
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Unknown, Unknown, link type is auto, media type is RJ45
  output flow-control is unsupported, input flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:02, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     387 packets input, 47968 bytes, 0 no buffer
     Received 4 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input

R1(config-if)#
R1(config-if)#do sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.4.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.5.0/24, 2 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
        via 172.16.3.3 (3072/2816), GigabitEthernet0/2
        via 172.16.4.4 (2562816/2816), GigabitEthernet0/3
P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.16.3.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/2
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.16.4.0/24, 1 successors, FD is 2562560
        via Connected, GigabitEthernet0/3
        via 172.16.2.2 (3328/3072), GigabitEthernet0/1
        via 172.16.3.3 (3328/3072), GigabitEthernet0/2

R1(config-if)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:01:27, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:01:27, GigabitEthernet0/1

variance unequal-cost load balancing

R1(config-if)#delay 2
R1(config-if)#do sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.4.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.5.0/24, 2 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
        via 172.16.3.3 (3072/2816), GigabitEthernet0/2
        via 172.16.4.4 (3328/2816), GigabitEthernet0/3
P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.16.3.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/2
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.16.4.0/24, 1 successors, FD is 3072
        via Connected, GigabitEthernet0/3

R1(config-if)#exit
R1(config)#router eigrp 2
R1(config-router)#varia
R1(config-router)#variance ?
  <1-128>  Metric variance multiplier

R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:01:09, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:01:09, GigabitEthernet0/1
R1(config-router)#vari
R1(config-router)#variance 2
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:01:27, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:01:27, GigabitEthernet0/1

take no effect…

R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:01:56, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:01:56, GigabitEthernet0/1
R1(config-router)#do sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.4.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.5.0/24, 2 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
        via 172.16.3.3 (3072/2816), GigabitEthernet0/2
        via 172.16.4.4 (3328/2816), GigabitEthernet0/3
P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.16.3.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/2
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.16.4.0/24, 1 successors, FD is 3072
        via Connected, GigabitEthernet0/3

EIGRP-IPv4 Topology Table for AS(2)/ID(172.16.4.1)

R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:04:14, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:04:14, GigabitEthernet0/1
R1(config-router)#do clear ip ro *
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:00:06, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:00:06, GigabitEthernet0/1
R1(config-router)#do clear ip eigrp pro
R1(config-router)#do clear ip eigrp process
                                    ^
% Invalid input detected at '^' marker.

R1(config-router)#^Z
R1#
*Oct  7 07:44:59.018: %SYS-5-CONFIG_I: Configured from console by console
R1#sh run | s eigrp
router eigrp 1
 network 172.16.1.1 0.0.0.0
 network 172.16.2.1 0.0.0.0
 network 172.16.3.1 0.0.0.0
 network 172.16.4.1 0.0.0.0
router eigrp 2
 variance 2

oh god, my eigrp as number mistake…

R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#no eigr
R1(config)#no router eigpr 2
                        ^
% Invalid input detected at '^' marker.

R1(config)#no router eigrp 2
R1(config)#do sh run | sec eigrp
router eigrp 1
 network 172.16.1.1 0.0.0.0
 network 172.16.2.1 0.0.0.0
 network 172.16.3.1 0.0.0.0
 network 172.16.4.1 0.0.0.0
R1(config)#router eigrp 1
R1(config-router)#vari
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3072] via 172.16.3.3, 00:00:20, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:00:20, GigabitEthernet0/1
R1(config-router)#do sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.4.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.5.0/24, 2 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
        via 172.16.3.3 (3072/2816), GigabitEthernet0/2
        via 172.16.4.4 (3328/2816), GigabitEthernet0/3
P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.16.3.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/2
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.16.4.0/24, 1 successors, FD is 3072
        via Connected, GigabitEthernet0/3

R1(config-router)#vari
R1(config-router)#variance 2
R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 9 subnets, 2 masks
D        172.16.5.0/24 [90/3328] via 172.16.4.4, 00:00:08, GigabitEthernet0/3
                       [90/3072] via 172.16.3.3, 00:00:08, GigabitEthernet0/2
                       [90/3072] via 172.16.2.2, 00:00:08, GigabitEthernet0/1
R1(config-router)#do sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.4.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.5.0/24, 3 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
        via 172.16.3.3 (3072/2816), GigabitEthernet0/2
        via 172.16.4.4 (3328/2816), GigabitEthernet0/3
P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.16.3.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/2
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.16.4.0/24, 1 successors, FD is 3072
        via Connected, GigabitEthernet0/3

R1(config-router)#do sh run | s eigrp
router eigrp 1
 variance 2
 network 172.16.1.1 0.0.0.0
 network 172.16.2.1 0.0.0.0
 network 172.16.3.1 0.0.0.0
 network 172.16.4.1 0.0.0.0
R1(config-router)#do sh ip protocols | s eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.4.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 2

configuration, verification ok.

PC-1> ping 172.16.5.102
172.16.5.102 icmp_seq=1 timeout
172.16.5.102 icmp_seq=2 timeout
84 bytes from 172.16.5.102 icmp_seq=3 ttl=62 time=3.684 ms
84 bytes from 172.16.5.102 icmp_seq=4 ttl=62 time=2.741 ms
84 bytes from 172.16.5.102 icmp_seq=5 ttl=62 time=2.741 ms

auto-summary

  • R1
en
conf t
!
hostname R1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.1.1 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.2.1 255.255.255.0
no shut
exit
!
end
wr
  • R2
en
conf t
!
hostname R2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.2.2 255.255.255.0
no shut
exit
int gig0/1
ip address 172.17.1.2 255.255.255.0
no shut
exit
!
end
wr
  • R3
en
conf t
!
hostname R3
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.17.1.3 255.255.255.0
no shut
exit
int gig0/1
ip address 172.17.2.3 255.255.255.0
no shut
exit
!
end
wr
  • PC1
ip 172.16.1.101 255.255.255.0 172.16.1.1
save
  • PC2
ip 172.17.2.102 255.255.255.0 172.17.2.3
save

EIGRP Configuration

  • R1
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.1.1 0.0.0.0
network 172.16.2.1 0.0.0.0
exit
!
end
  • R2
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.2.2 0.0.0.0
network 172.17.1.2 0.0.0.0
exit
!
end
  • R3
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.17.1.3 0.0.0.0
network 172.17.2.3 0.0.0.0
!
end
R1#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.17.0.0/24 is subnetted, 2 subnets
D        172.17.1.0 [90/3072] via 172.16.2.2, 00:00:22, GigabitEthernet0/1
D        172.17.2.0 [90/3328] via 172.16.2.2, 00:00:17, GigabitEthernet0/1
R1#sh ip protocols | section eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.2.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1
R1#sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.2.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.1.1/32
    172.16.2.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.2.2            90      00:04:37
  Distance: internal 90 external 170

R1#sh ip pro
R1#sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.2.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.1.1/32
    172.16.2.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.2.2            90      00:05:20
  Distance: internal 90 external 170

R1#sh run all | section eigrp
router eigrp 1
 timers active-time 3
 timers graceful-restart purge-time 240
 metric maximum-hops 100
 metric weights 0 1 0 1 0 0
 traffic-share balanced
 variance 1
 network 172.16.1.1 0.0.0.0
 network 172.16.2.1 0.0.0.0
 distance eigrp 90 170
 no auto-summary
 no passive-interface default
 eigrp log-neighbor-changes
 eigrp log-neighbor-warnings 10
 eigrp event-log-size 500
 no shutdown
monitor event-trace eigrp perf-events rate-limiting 1
R2#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
D        172.16.1.0/24 [90/3072] via 172.16.2.1, 00:00:27, GigabitEthernet0/0
      172.17.0.0/16 is variably subnetted, 3 subnets, 2 masks
D        172.17.2.0/24 [90/3072] via 172.17.1.3, 00:00:22, GigabitEthernet0/1
R2#sh ip protocols | section eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.17.1.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1
R2#sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.17.1.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.2.2/32
    172.17.1.2/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.17.1.3            90      00:04:58
    172.16.2.1            90      00:05:03
  Distance: internal 90 external 170
R3#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/24 is subnetted, 2 subnets
D        172.16.1.0 [90/3328] via 172.17.1.2, 00:00:22, GigabitEthernet0/0
D        172.16.2.0 [90/3072] via 172.17.1.2, 00:00:22, GigabitEthernet0/0
R3#sh ip protocols | section eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.17.2.3
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1
R3#sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.17.2.3
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.17.1.3/32
    172.17.2.3/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.17.1.2            90      00:06:42
  Distance: internal 90 external 170

show ip protocols | section eigrp snipping rest of sections… It this bug?

PC-1> ping 172.17.2.102
84 bytes from 172.17.2.102 icmp_seq=1 ttl=61 time=16.078 ms
84 bytes from 172.17.2.102 icmp_seq=2 ttl=61 time=4.833 ms
84 bytes from 172.17.2.102 icmp_seq=3 ttl=61 time=4.316 ms
84 bytes from 172.17.2.102 icmp_seq=4 ttl=61 time=4.892 ms
84 bytes from 172.17.2.102 icmp_seq=5 ttl=61 time=7.253 ms

no auto-summary is default.

on R2.

conf t
!
router eigrp 1
auto-summary
exit
!
end
R2#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R2(config)#router
R2(config)#router eigr
R2(config)#router eigrp 1
R2(config-router)#auto-sum
R2(config-router)#auto-summary
R2(config-router)#
*Oct  7 09:10:32.567: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.17.1.3 (GigabitEthernet0/1) is resync: summary configured
*Oct  7 09:10:32.567: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.2.1 (GigabitEthernet0/0) is resync: summary configured
*Oct  7 09:10:32.575: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.2.1 (GigabitEthernet0/0) is resync: summary up, remove components
*Oct  7 09:10:32.577: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.17.1.3 (GigabitEthernet0/1) is resync: summary up, remove components
R1#
*Oct  7 09:10:33.439: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.2.2 (GigabitEthernet0/1) is resync: peer graceful-restart
R3#
*Oct  7 09:10:33.456: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.17.1.2 (GigabitEthernet0/0) is resync: peer graceful-restart
R1#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

D     172.17.0.0/16 [90/3072] via 172.16.2.2, 00:02:18, GigabitEthernet0/1
R1#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

D     172.17.0.0/16 [90/3072] via 172.16.2.2, 00:02:18, GigabitEthernet0/1
R1#sh ip eigrp topo
R1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.2.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.17.0.0/16, 1 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
R2#sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.17.1.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: enabled
    172.17.0.0/16 for Gi0/0
      Summarizing 2 components with metric 2816
    172.16.0.0/16 for Gi0/1
      Summarizing 2 components with metric 2816
  Maximum path: 4
  Routing for Networks:
    172.16.2.2/32
    172.17.1.2/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.17.1.3            90      00:01:23
    172.16.2.1            90      00:01:23
  Distance: internal 90 external 170

R2#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks
D        172.16.0.0/16 is a summary, 00:02:09, Null0
D        172.16.1.0/24 [90/3072] via 172.16.2.1, 00:25:13, GigabitEthernet0/0
      172.17.0.0/16 is variably subnetted, 4 subnets, 3 masks
D        172.17.0.0/16 is a summary, 00:02:09, Null0
D        172.17.2.0/24 [90/3072] via 172.17.1.3, 00:25:08, GigabitEthernet0/1
R2#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.17.1.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.16.0.0/16, 1 successors, FD is 2816
        via Summary (2816/0), Null0
P 172.17.2.0/24, 1 successors, FD is 3072
        via 172.17.1.3 (3072/2816), GigabitEthernet0/1
P 172.17.0.0/16, 1 successors, FD is 2816
        via Summary (2816/0), Null0
P 172.16.1.0/24, 1 successors, FD is 3072
        via 172.16.2.1 (3072/2816), GigabitEthernet0/0
P 172.17.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1

R2#sh run all | section eigrp
router eigrp 1
 timers active-time 3
 timers graceful-restart purge-time 240
 metric maximum-hops 100
 metric weights 0 1 0 1 0 0
 traffic-share balanced
 variance 1
 network 172.16.2.2 0.0.0.0
 network 172.17.1.2 0.0.0.0
 distance eigrp 90 170
 auto-summary
 no passive-interface default
 eigrp log-neighbor-changes
 eigrp log-neighbor-warnings 10
 eigrp event-log-size 500
 no shutdown
monitor event-trace eigrp perf-events rate-limiting 1
R3#sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

D     172.16.0.0/16 [90/3072] via 172.17.1.2, 00:02:23, GigabitEthernet0/0
R3#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.17.2.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.0.0/16, 1 successors, FD is 3072
        via 172.17.1.2 (3072/2816), GigabitEthernet0/0
P 172.17.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.17.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
PC-1> ping 172.17.2.102
172.17.2.102 icmp_seq=1 timeout
172.17.2.102 icmp_seq=2 timeout
84 bytes from 172.17.2.102 icmp_seq=3 ttl=61 time=4.877 ms
84 bytes from 172.17.2.102 icmp_seq=4 ttl=61 time=4.927 ms
84 bytes from 172.17.2.102 icmp_seq=5 ttl=61 time=5.332 ms

passive-interface

  • R1
en
conf t
!
hostname R1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.1.1 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.2.1 255.255.255.0
no shut
exit
!
end
wr
  • R2
en
conf t
!
hostname R2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.2.2 255.255.255.0
no shut
exit
int gig0/1
ip address 172.17.1.2 255.255.255.0
no shut
exit
!
end
wr
  • R3
en
conf t
!
hostname R3
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.17.1.3 255.255.255.0
no shut
exit
int gig0/1
ip address 172.17.2.3 255.255.255.0
no shut
exit
!
end
wr
  • PC1
ip 172.16.1.101 255.255.255.0 172.16.1.1
save
  • PC2
ip 172.17.2.102 255.255.255.0 172.17.2.3
save
  • R1
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.1.1 0.0.0.0
network 172.16.2.1 0.0.0.0
exit
!
end
  • R2
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.2.2 0.0.0.0
network 172.17.1.2 0.0.0.0
exit
!
end
  • R3
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.17.1.3 0.0.0.0
network 172.17.2.3 0.0.0.0
!
end
debug ip eigrp
  • R1
conf t
!
router eigrp 1
passive-interface gig0/0
exit
!
end
  • R3
conf t
!
router eigrp 1
passive-interface gig0/1
exit
!
end
R1#debug ip eigrp
EIGRP-IPv4 Route Event debugging is on
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#!
R1(config)#router eigrp 1
R1(config-router)#passi
R1(config-router)#passive-interface gig0/0
R1(config-router)#do sh ip protocols
*** IP Routing is NSF aware ***

Routing Protocol is "application"
  Sending updates every 0 seconds
  Invalid after 0 seconds, hold down 0, flushed after 0
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Maximum path: 32
  Routing for Networks:
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: (default is 4)

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.2.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.1.1/32
    172.16.2.1/32
  Passive Interface(s):
    GigabitEthernet0/0
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.2.2            90      00:07:29
  Distance: internal 90 external 170
R3#debug ip eigrp
EIGRP-IPv4 Route Event debugging is on
R3#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R3(config)#!
R3(config)#router eigrp 1
R3(config-router)#passi
R3(config-router)#passive-interface gig0/1
R3(config-router)#do sh ip proto
R3(config-router)#do sh ip protocol
R3(config-router)#do sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.17.2.3
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.17.1.3/32
    172.17.2.3/32
  Passive Interface(s):
    GigabitEthernet0/1
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.17.1.2            90      00:07:48
  Distance: internal 90 external 170

R1(config-router)#do sh ip ro eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.17.0.0/24 is subnetted, 2 subnets
D        172.17.1.0 [90/3072] via 172.16.2.2, 00:09:27, GigabitEthernet0/1
D        172.17.2.0 [90/3328] via 172.16.2.2, 00:09:27, GigabitEthernet0/1

Let's check packets.

passive-interface default for Layer 3 switch

  • SW1
en
conf t
!
hostname SW1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
ip routing
!
vlan 10,20,30,40
exit
!
int vlan 10
ip address 172.16.10.1 255.255.255.0
no shut
exit
int vlan 20
ip address 172.16.20.1 255.255.255.0
no shut
exit
int vlan 30
ip address 172.16.30.1 255.255.255.0
no shut
exit
int vlan 40
ip address 172.16.40.1 255.255.255.0
no shut
exit
!
int gig0/0
switchport mode access
switchport access vlan 10
exit
int gig0/1
switchport mode access
switchport access vlan 20
exit
int gig0/2
switchport mode access
switchport access vlan 30
exit
int gig0/3
switchport mode access
switchport access vlan 40
exit
!
router eigrp 1
network 172.16.10.1 0.0.0.0
network 172.16.20.1 0.0.0.0
network 172.16.30.1 0.0.0.0
network 172.16.40.1 0.0.0.0
exit
!
end
wr
  • SW2
en
conf t
!
hostname SW2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
ip routing
!
vlan 10,50,60,70
exit
!
int vlan 10
ip address 172.16.10.2 255.255.255.0
no shut
exit
int vlan 50
ip address 172.16.50.2 255.255.255.0
no shut
exit
int vlan 60
ip address 172.16.60.2 255.255.255.0
no shut
exit
int vlan 70
ip address 172.16.70.2 255.255.255.0
no shut
exit
!
int gig0/0
switchport mode access
switchport access vlan 10
exit
int gig0/1
switchport mode access
switchport access vlan 50
exit
int gig0/2
switchport mode access
switchport access vlan 60
exit
int gig0/3
switchport mode access
switchport access vlan 70
exit
!
router eigrp 1
network 172.16.10.2 0.0.0.0
network 172.16.50.2 0.0.0.0
network 172.16.60.2 0.0.0.0
network 172.16.70.2 0.0.0.0
exit
!
end
wr
  • PC1
ip 172.16.20.101 255.255.255.0 172.16.20.1
save
  • PC2
ip 172.16.30.102 255.255.255.0 172.16.30.1
save
  • PC3
ip 172.16.40.103 255.255.255.0 172.16.40.1
save
  • PC4
ip 172.16.50.104 255.255.255.0 172.16.50.2
save
  • PC5
ip 172.16.60.105 255.255.255.0 172.16.60.2
save
  • PC6
ip 172.16.70.106 255.255.255.0 172.16.70.2
save
SW1#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 11 subnets, 2 masks
C        172.16.10.0/24 is directly connected, Vlan10
L        172.16.10.1/32 is directly connected, Vlan10
C        172.16.20.0/24 is directly connected, Vlan20
L        172.16.20.1/32 is directly connected, Vlan20
C        172.16.30.0/24 is directly connected, Vlan30
L        172.16.30.1/32 is directly connected, Vlan30
C        172.16.40.0/24 is directly connected, Vlan40
L        172.16.40.1/32 is directly connected, Vlan40
D        172.16.50.0/24 [90/3072] via 172.16.10.2, 00:00:38, Vlan10
D        172.16.60.0/24 [90/3072] via 172.16.10.2, 00:00:38, Vlan10
D        172.16.70.0/24 [90/3072] via 172.16.10.2, 00:00:38, Vlan10
SW1#sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.40.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.10.1/32
    172.16.20.1/32
    172.16.30.1/32
    172.16.40.1/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.10.2           90      00:01:59
  Distance: internal 90 external 170
SW2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 11 subnets, 2 masks
C        172.16.10.0/24 is directly connected, Vlan10
L        172.16.10.2/32 is directly connected, Vlan10
D        172.16.20.0/24 [90/3072] via 172.16.10.1, 00:00:42, Vlan10
D        172.16.30.0/24 [90/3072] via 172.16.10.1, 00:00:42, Vlan10
D        172.16.40.0/24 [90/3072] via 172.16.10.1, 00:00:42, Vlan10
C        172.16.50.0/24 is directly connected, Vlan50
L        172.16.50.2/32 is directly connected, Vlan50
C        172.16.60.0/24 is directly connected, Vlan60
L        172.16.60.2/32 is directly connected, Vlan60
C        172.16.70.0/24 is directly connected, Vlan70
L        172.16.70.2/32 is directly connected, Vlan70
SW2#sh ip protocols | begin eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.70.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.10.2/32
    172.16.50.2/32
    172.16.60.2/32
    172.16.70.2/32
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.10.1           90      00:02:07
  Distance: internal 90 external 170
PC-1> ping 172.16.70.106
84 bytes from 172.16.70.106 icmp_seq=1 ttl=62 time=44.674 ms
84 bytes from 172.16.70.106 icmp_seq=2 ttl=62 time=11.751 ms
84 bytes from 172.16.70.106 icmp_seq=3 ttl=62 time=8.385 ms
84 bytes from 172.16.70.106 icmp_seq=4 ttl=62 time=13.396 ms
84 bytes from 172.16.70.106 icmp_seq=5 ttl=62 time=9.879 ms
debug eigrp packets hello
SW1#debug eigrp packets hello
    (HELLO)
EIGRP Packet debugging is on
SW1#
*Oct  7 11:48:38.260: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:48:38.261:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:48:38.397: EIGRP: Sending HELLO on Vl20 - paklen 20
*Oct  7 11:48:38.398:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1#
*Oct  7 11:48:39.501: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:48:39.502:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1#
*Oct  7 11:48:41.717: EIGRP: Sending HELLO on Vl40 - paklen 20
*Oct  7 11:48:41.718:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:42.494: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:48:42.495:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1#
*Oct  7 11:48:43.096: EIGRP: Sending HELLO on Vl20 - paklen 20
*Oct  7 11:48:43.097:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:43.216: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:48:43.217:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW1#
*Oct  7 11:48:44.363: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:48:44.364:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1#
*Oct  7 11:48:46.268: EIGRP: Sending HELLO on Vl40 - paklen 20
*Oct  7 11:48:46.268:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1#
SW2#debug eigrp packets hello
    (HELLO)
EIGRP Packet debugging is on
SW2#
*Oct  7 11:48:37.419: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:48:37.421:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:48:38.109: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:48:38.109:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:39.846: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:48:39.847:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:39.940: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:48:39.941:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:40.626: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:48:40.626:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:42.329: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:48:42.330:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:48:42.979: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:48:42.980:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:44.275: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:48:44.276:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:44.557: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:48:44.558:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:45.480: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:48:45.481:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:47.334: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:48:47.335:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:48:47.651: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:48:47.652:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:48.747: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:48:48.748:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:49.118: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:48:49.119:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:50.154: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:48:50.155:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:52.003: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:48:52.004:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:48:52.300: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:48:52.300:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:53.220: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:48:53.220:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:48:53.779: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:48:53.780:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#
*Oct  7 11:48:54.618: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:48:54.619:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2#

very noisy hello…

conf t
!
router eigrp 1
passive-interface default
no passive-interface vlan 10
!
end
SW1(config-router)#passive-interface default
*Oct  7 11:50:45.503: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:50:45.503:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:50:46.226: EIGRP: Sending HELLO on Vl20 - paklen 20
*Oct  7 11:50:46.226:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:46.344: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:50:46.344:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#no passi
SW1(config-router)#no passive-interface
*Oct  7 11:50:47.083: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:50:47.084:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:47.418: EIGRP: Sending HELLO on Vl40 - paklen 20
*Oct  7 11:50:47.419:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#no passive-interface vlan
*Oct  7 11:50:50.503: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:50:50.505:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:50:50.727: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:50:50.728:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:50.820: EIGRP: Sending HELLO on Vl20 - paklen 20
*Oct  7 11:50:50.821:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 1
SW1(config-router)#no passive-interface vlan 10
SW1(config-router)#
*Oct  7 11:50:51.803: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:50:51.804:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:52.355: EIGRP: Sending HELLO on Vl40 - paklen 20
*Oct  7 11:50:52.356:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:50:54.777: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:50:54.778:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:50:55.455: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:50:55.456:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:55.685: EIGRP: Sending HELLO on Vl20 - paklen 20
*Oct  7 11:50:55.685:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:50:56.608: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:50:56.608:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:56.805: EIGRP: Sending HELLO on Vl40 - paklen 20
*Oct  7 11:50:56.805:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:50:59.168: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:50:59.169:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:50:59.722: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:50:59.722:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#passi
SW1(config-router)#passive-interface
*Oct  7 11:51:00.756: EIGRP: Sending HELLO on Vl20 - paklen 20
*Oct  7 11:51:00.756:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:01.391: EIGRP: Sending HELLO on Vl40 - paklen 20
*Oct  7 11:51:01.392:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:01.585: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:01.586:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#passive-interface defau
SW1(config-router)#passive-interface default
SW1(config-router)#
*Oct  7 11:51:04.154: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:51:04.155:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:51:04.426: EIGRP: Sending HELLO on Vl30 - paklen 20
*Oct  7 11:51:04.427:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:05.102: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:05.103:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:51:05.105: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.10.2 (Vlan10) is down: interface passive
SW1(config-router)#no pass
SW1(config-router)#no passive-interface vlan 10
SW1(config-router)#
*Oct  7 11:51:32.819: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:32.820:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:51:37.682: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:37.683:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:38.289: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.2
*Oct  7 11:51:38.290:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0
*Oct  7 11:51:38.291: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.10.2 (Vlan10) is up: new adjacency
SW1(config-router)#
*Oct  7 11:51:38.296: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:38.297:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/1
*Oct  7 11:51:38.314: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.2
*Oct  7 11:51:38.315:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/1
SW1(config-router)#
*Oct  7 11:51:43.319: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.2
*Oct  7 11:51:43.320:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:51:43.471: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:43.472:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:51:47.759: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.2
*Oct  7 11:51:47.760:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:51:47.909: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:47.909:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:51:52.403: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:52.404:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:52.560: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.2
*Oct  7 11:51:52.561:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW1(config-router)#
*Oct  7 11:51:56.942: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.2
*Oct  7 11:51:56.943:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:51:57.041: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:57.042:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:50:50.450: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:50:50.451:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:50:51.737: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:50:51.737:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:50:53.564: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:50:53.565:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:53.880: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:50:53.881:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:54.377: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:50:54.377:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#no passi
*Oct  7 11:50:54.748: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:50:54.748:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#no passive-interface v
*Oct  7 11:50:56.596: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:50:56.598:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0la
SW2(config-router)#no passive-interface vlan 10
SW2(config-router)#
*Oct  7 11:50:58.319: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:50:58.320:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:58.334: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:50:58.334:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:59.178: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:50:59.178:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:50:59.268: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:50:59.269:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:51:01.593: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:51:01.594:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:51:02.879: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:51:02.880:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:02.982: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:51:02.982:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:03.585: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:51:03.586:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:51:04.169: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:04.169:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:05.102: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:51:05.104:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:51:05.105:        Interface PEER-TERMINATION received
SW2(config-router)#
*Oct  7 11:51:05.106: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.10.1 (Vlan10) is down: Interface PEER-TERMINATION received
SW2(config-router)#passi
SW2(config-router)#passive-interface d
*Oct  7 11:51:07.481: EIGRP: Sending HELLO on Vl60 - paklen 20
*Oct  7 11:51:07.482:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:07.763: EIGRP: Sending HELLO on Vl70 - paklen 20
*Oct  7 11:51:07.763:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0ef
SW2(config-router)#passive-interface defau
SW2(config-router)#passive-interface default
SW2(config-router)#
*Oct  7 11:51:08.554: EIGRP: Sending HELLO on Vl50 - paklen 20
*Oct  7 11:51:08.555:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:09.156: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:09.156:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#no passi
SW2(config-router)#no passive-interface vlan 10
SW2(config-router)#
*Oct  7 11:51:38.302: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:51:38.302:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:38.316: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.1
*Oct  7 11:51:38.318:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0
*Oct  7 11:51:38.322: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.10.1 (Vlan10) is up: new adjacency
SW2(config-router)#
*Oct  7 11:51:38.329: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:38.330:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 1/0 iidbQ un/rely 0/1
SW2(config-router)#
*Oct  7 11:51:43.382: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:43.382:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:43.567: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.1
*Oct  7 11:51:43.568:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:51:47.760: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:47.760:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:47.947: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.1
*Oct  7 11:51:47.948:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:51:52.470: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.1
*Oct  7 11:51:52.471:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:51:52.596: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:52.597:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:51:57.010: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:51:57.011:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:51:57.123: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.1
*Oct  7 11:51:57.123:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:52:01.486: EIGRP: Sending HELLO on Vl10 - paklen 30
*Oct  7 11:52:01.487:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:52:01.540: EIGRP: Received HELLO on Vl10 - paklen 30 nbr 172.16.10.1
*Oct  7 11:52:01.541:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:52:06.099: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:52:06.100:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
*Oct  7 11:52:06.195: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:52:06.196:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#
*Oct  7 11:52:11.033: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:52:11.034:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
*Oct  7 11:52:11.072: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:52:11.072:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#do u all
All possible debugging has been turned off
SW1(config-router)#
*Oct  7 11:53:44.462: EIGRP: Sending HELLO on Vl10 - paklen 20
*Oct  7 11:53:44.462:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0
SW1(config-router)#^Z
SW1#
*Oct  7 11:53:58.015: %SYS-5-CONFIG_I: Configured from console by console
SW1#
SW2(config-router)#do u all
All possible debugging has been turned off
SW2(config-router)#
*Oct  7 11:53:49.061: EIGRP: Received HELLO on Vl10 - paklen 20 nbr 172.16.10.1
*Oct  7 11:53:49.061:   AS 1, Flags 0x0:(NULL), Seq 0/0 interfaceQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0
SW2(config-router)#^Z
SW2#
*Oct  7 11:53:59.577: %SYS-5-CONFIG_I: Configured from console by console
SW2#
SW1#sh ip protocols | b eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.40.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.10.1/32
    172.16.20.1/32
    172.16.30.1/32
    172.16.40.1/32
  Passive Interface(s):
    Vlan20
    Vlan30
    Vlan40
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.10.2           90      00:03:53
  Distance: internal 90 external 170

SW1#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 11 subnets, 2 masks
C        172.16.10.0/24 is directly connected, Vlan10
L        172.16.10.1/32 is directly connected, Vlan10
C        172.16.20.0/24 is directly connected, Vlan20
L        172.16.20.1/32 is directly connected, Vlan20
C        172.16.30.0/24 is directly connected, Vlan30
L        172.16.30.1/32 is directly connected, Vlan30
C        172.16.40.0/24 is directly connected, Vlan40
L        172.16.40.1/32 is directly connected, Vlan40
D        172.16.50.0/24 [90/3072] via 172.16.10.2, 00:05:48, Vlan10
D        172.16.60.0/24 [90/3072] via 172.16.10.2, 00:05:48, Vlan10
D        172.16.70.0/24 [90/3072] via 172.16.10.2, 00:05:48, Vlan10
SW2#sh ip protocols | b eigrp
Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    Soft SIA disabled
    NSF-aware route hold timer is 240
    Router-ID: 172.16.70.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    172.16.10.2/32
    172.16.50.2/32
    172.16.60.2/32
    172.16.70.2/32
  Passive Interface(s):
    Vlan50
    Vlan60
    Vlan70
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.10.1           90      00:04:04
  Distance: internal 90 external 170

SW2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 11 subnets, 2 masks
C        172.16.10.0/24 is directly connected, Vlan10
L        172.16.10.2/32 is directly connected, Vlan10
D        172.16.20.0/24 [90/3072] via 172.16.10.1, 00:05:51, Vlan10
D        172.16.30.0/24 [90/3072] via 172.16.10.1, 00:05:51, Vlan10
D        172.16.40.0/24 [90/3072] via 172.16.10.1, 00:05:51, Vlan10
C        172.16.50.0/24 is directly connected, Vlan50
L        172.16.50.2/32 is directly connected, Vlan50
C        172.16.60.0/24 is directly connected, Vlan60
L        172.16.60.2/32 is directly connected, Vlan60
C        172.16.70.0/24 is directly connected, Vlan70
L        172.16.70.2/32 is directly connected, Vlan70
PC-1> ping 172.16.70.106
172.16.70.106 icmp_seq=1 timeout
172.16.70.106 icmp_seq=2 timeout
172.16.70.106 icmp_seq=3 timeout
172.16.70.106 icmp_seq=4 timeout
172.16.70.106 icmp_seq=5 timeout

PC-1> ping 172.16.70.2
84 bytes from 172.16.70.2 icmp_seq=1 ttl=254 time=16.046 ms
84 bytes from 172.16.70.2 icmp_seq=2 ttl=254 time=16.329 ms
^C

ping failing to PC-6. But ping to SW2 Vlan70 SVI address successful.

Reloading PC-6, ping successful.

This behavior may be a mixed bug caused by GNS3 environment, IOSvL2, and VPC.

PC-1> ping 172.16.70.106
84 bytes from 172.16.70.106 icmp_seq=1 ttl=62 time=13.932 ms
172.16.70.106 icmp_seq=2 timeout
172.16.70.106 icmp_seq=3 timeout
84 bytes from 172.16.70.106 icmp_seq=4 ttl=62 time=20.193 ms
84 bytes from 172.16.70.106 icmp_seq=5 ttl=62 time=15.717 ms

PC-1> ping 172.16.70.106
84 bytes from 172.16.70.106 icmp_seq=1 ttl=62 time=15.988 ms
84 bytes from 172.16.70.106 icmp_seq=2 ttl=62 time=8.190 ms
84 bytes from 172.16.70.106 icmp_seq=3 ttl=62 time=11.418 ms
84 bytes from 172.16.70.106 icmp_seq=4 ttl=62 time=15.598 ms
84 bytes from 172.16.70.106 icmp_seq=5 ttl=62 time=5.921 ms

Verified passive-interface default configuration.

distribute-list

How Does the Passive Interface Feature Work in EIGRP? - Cisco

I can't understand this command needs situation…

  • R1
en
conf t
!
hostname R1
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.1.1 255.255.255.0
no shut
exit
int gig0/1
ip address 172.16.2.1 255.255.255.0
no shut
exit
!
end
wr
  • R2
en
conf t
!
hostname R2
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.16.2.2 255.255.255.0
no shut
exit
int gig0/1
ip address 172.17.1.2 255.255.255.0
no shut
exit
!
end
wr
  • R3
en
conf t
!
hostname R3
no ip domain-lookup
line console 0
exec-timeout 0 0
logging synchronous
!
int gig0/0
ip address 172.17.1.3 255.255.255.0
no shut
exit
int gig0/1
ip address 172.17.2.3 255.255.255.0
no shut
exit
!
end
wr
  • PC1
ip 172.16.1.101 255.255.255.0 172.16.1.1
save
  • PC2
ip 172.17.2.102 255.255.255.0 172.17.2.3
save
  • R1
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.1.1 0.0.0.0
network 172.16.2.1 0.0.0.0
exit
!
end
  • R2
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.16.2.2 0.0.0.0
network 172.17.1.2 0.0.0.0
exit
!
end
  • R3
en
conf t
!
! EIGRP Configuration
router eigrp 1
network 172.17.1.3 0.0.0.0
network 172.17.2.3 0.0.0.0
!
end
debug ip eigrp
  • R1
conf t
!
access-list 1 deny any
!
router eigrp 1
distribute-list 1 out gig0/1
exit
!
end
R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#router eigrp 1
R1(config-router)#exit
R1(config)#acce
R1(config)#access-list 1 den
R1(config)#access-list 1 deny any
R1(config)#access-list 1 deny any any
R1(config)#access-list 1 deny any any
Translating "any"
                                  ^
% Invalid input detected at '^' marker.

R1(config)#access-list 1 deny any ?
  log  Log matches against this entry
  <cr>

R1(config)#access-list 1 deny ?
  Hostname or A.B.C.D  Address to match
  any                  Any source host
  host                 A single host address

R1(config)#access-list 1 deny an
R1(config)#access-list 1 deny any
R1(config)#router
R1(config)#router eigrp 1
R1(config-router)#distri
R1(config-router)#distribute-list 1 o
R1(config-router)#distribute-list 1 out gig0/1
R1(config-router)#
*Oct  7 11:09:43.207: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.2.2 (GigabitEthernet0/1) is resync: intf route configuration changed
R2#
*Oct  7 11:09:43.332: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.2.1 (GigabitEthernet0/0) is resync: peer graceful-restart
R2#
R1(config-router)#^Z
R1#sh
*Oct  7 11:10:27.035: %SYS-5-CONFIG_I: Configured from console by console
R1#sh run | s eigrp
router eigrp 1
 distribute-list 1 out GigabitEthernet0/1
 network 172.16.1.1 0.0.0.0
 network 172.16.2.1 0.0.0.0
R1#sh run | i access-list 1
access-list 1 deny   any
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   172.16.2.2              Gi0/1                    10 00:20:27  190  1140  0  9
R1#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C        172.16.1.0/24 is directly connected, GigabitEthernet0/0
L        172.16.1.1/32 is directly connected, GigabitEthernet0/0
C        172.16.2.0/24 is directly connected, GigabitEthernet0/1
L        172.16.2.1/32 is directly connected, GigabitEthernet0/1
      172.17.0.0/24 is subnetted, 2 subnets
D        172.17.1.0 [90/3072] via 172.16.2.2, 00:21:01, GigabitEthernet0/1
D        172.17.2.0 [90/3328] via 172.16.2.2, 00:20:57, GigabitEthernet0/1
R1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.16.2.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.17.2.0/24, 1 successors, FD is 3328
        via 172.16.2.2 (3328/3072), GigabitEthernet0/1
P 172.16.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.17.1.0/24, 1 successors, FD is 3072
        via 172.16.2.2 (3072/2816), GigabitEthernet0/1
R2#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
1   172.16.2.1              Gi0/0                    14 00:20:34  409  2454  0  6
0   172.17.1.3              Gi0/1                    10 00:20:34  171  1026  0  5
R2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.2.0/24 is directly connected, GigabitEthernet0/0
L        172.16.2.2/32 is directly connected, GigabitEthernet0/0
      172.17.0.0/16 is variably subnetted, 3 subnets, 2 masks
C        172.17.1.0/24 is directly connected, GigabitEthernet0/1
L        172.17.1.2/32 is directly connected, GigabitEthernet0/1
D        172.17.2.0/24 [90/3072] via 172.17.1.3, 00:21:04, GigabitEthernet0/1
R2#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.17.1.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0
P 172.17.2.0/24, 1 successors, FD is 3072
        via 172.17.1.3 (3072/2816), GigabitEthernet0/1
P 172.17.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
R3#sh ip
*Oct  7 11:12:09.528: %SYS-5-CONFIG_I: Configured from console by console
R3#sh ip eigr
R3#sh ip eigrp nei
R3#sh ip eigrp neighbors
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   172.17.1.2              Gi0/0                    12 00:20:40  174  1044  0  8
R3#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/24 is subnetted, 1 subnets
D        172.16.2.0 [90/3072] via 172.17.1.2, 00:21:08, GigabitEthernet0/0
      172.17.0.0/16 is variably subnetted, 4 subnets, 2 masks
C        172.17.1.0/24 is directly connected, GigabitEthernet0/0
L        172.17.1.3/32 is directly connected, GigabitEthernet0/0
C        172.17.2.0/24 is directly connected, GigabitEthernet0/1
L        172.17.2.3/32 is directly connected, GigabitEthernet0/1
R3#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(1)/ID(172.17.2.3)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 172.16.2.0/24, 1 successors, FD is 3072
        via 172.17.1.2 (3072/2816), GigabitEthernet0/0
P 172.17.2.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/1
P 172.17.1.0/24, 1 successors, FD is 2816
        via Connected, GigabitEthernet0/0

sure, ping failed, because R2, R3 don't know the route to 172.16.1.0/24.

PC-1> ping 172.17.2.102
172.17.2.102 icmp_seq=1 timeout
172.17.2.102 icmp_seq=2 timeout
172.17.2.102 icmp_seq=3 timeout
172.17.2.102 icmp_seq=4 timeout
172.17.2.102 icmp_seq=5 timeout

References

tech/network/cisco/eigrp/eigrp/eigrp-basic/eigrp-basic.txt · Last modified: 2018/10/07 21:11 by wnoguchi