User Tools
tech:network:cisco:bgp:bgp:maximum-prefix:maximum-prefix
Table of Contents
BGP: maximum-prefix
Topology
IP
Project name: ccna-bgp31-maximum-prefix
- R1
enable configure terminal ! hostname R1 no ip domain-lookup line console 0 exec-timeout 0 0 logging synchronous exit ! interface Loopback 1 ip address 100.10.1.1 255.255.255.0 no shutdown exit interface Loopback 2 ip address 100.10.2.1 255.255.255.0 no shutdown exit interface Loopback 3 ip address 100.10.3.1 255.255.255.0 no shutdown exit interface Loopback 4 ip address 100.10.4.1 255.255.255.0 no shutdown exit interface Loopback 5 ip address 100.10.5.1 255.255.255.0 no shutdown exit interface Loopback 6 ip address 100.10.6.1 255.255.255.0 no shutdown exit interface Loopback 7 ip address 100.10.7.1 255.255.255.0 no shutdown exit interface Loopback 8 ip address 100.10.8.1 255.255.255.0 no shutdown exit interface Loopback 9 ip address 100.10.9.1 255.255.255.0 no shutdown exit interface Loopback 10 ip address 100.10.10.1 255.255.255.0 no shutdown exit interface Loopback 11 ip address 100.10.11.1 255.255.255.0 no shutdown exit interface Loopback 12 ip address 100.10.12.1 255.255.255.0 no shutdown exit interface Loopback 13 ip address 100.10.13.1 255.255.255.0 no shutdown exit interface Loopback 14 ip address 100.10.14.1 255.255.255.0 no shutdown exit interface Loopback 15 ip address 100.10.15.1 255.255.255.0 no shutdown exit interface Loopback 16 ip address 100.10.16.1 255.255.255.0 no shutdown exit interface Loopback 17 ip address 100.10.17.1 255.255.255.0 no shutdown exit interface Loopback 18 ip address 100.10.18.1 255.255.255.0 no shutdown exit interface Loopback 19 ip address 100.10.19.1 255.255.255.0 no shutdown exit interface Loopback 20 ip address 100.10.20.1 255.255.255.0 no shutdown exit interface GigabitEthernet 0/0 ip address 100.1.2.1 255.255.255.0 no shutdown exit ! end write
- R2
enable configure terminal ! hostname R2 no ip domain-lookup line console 0 exec-timeout 0 0 logging synchronous exit ! interface Loopback 1 ip address 100.20.1.2 255.255.255.0 no shutdown exit interface GigabitEthernet 0/0 ip address 100.1.2.2 255.255.255.0 no shutdown exit ! end write
Basic BGP Configuration
- R1
configure terminal ! router bgp 10 network 100.10.1.0 mask 255.255.255.0 neighbor 100.1.2.2 remote-as 20 exit ! end
- R2
configure terminal ! router bgp 20 network 100.20.1.0 mask 255.255.255.0 neighbor 100.1.2.1 remote-as 10 exit ! end
maximum-prefix Configuration
- R1
configure terminal ! router bgp 10 network 100.10.1.0 mask 255.255.255.0 network 100.10.2.0 mask 255.255.255.0 network 100.10.3.0 mask 255.255.255.0 network 100.10.4.0 mask 255.255.255.0 network 100.10.5.0 mask 255.255.255.0 network 100.10.6.0 mask 255.255.255.0 network 100.10.7.0 mask 255.255.255.0 network 100.10.8.0 mask 255.255.255.0 network 100.10.9.0 mask 255.255.255.0 network 100.10.10.0 mask 255.255.255.0 network 100.10.11.0 mask 255.255.255.0 network 100.10.12.0 mask 255.255.255.0 network 100.10.13.0 mask 255.255.255.0 network 100.10.14.0 mask 255.255.255.0 network 100.10.15.0 mask 255.255.255.0 network 100.10.16.0 mask 255.255.255.0 network 100.10.17.0 mask 255.255.255.0 network 100.10.18.0 mask 255.255.255.0 network 100.10.19.0 mask 255.255.255.0 network 100.10.20.0 mask 255.255.255.0 exit ! end
- R2 (Pattern 1)
configure terminal ! router bgp 20 neighbor 100.1.2.1 maximum-prefix 10 exit ! end
- R2 (Pattern 2)
configure terminal ! router bgp 20 neighbor 100.1.2.1 maximum-prefix 10 50 exit ! end
- R2 (Pattern 3)
configure terminal ! router bgp 20 neighbor 100.1.2.1 maximum-prefix 19 warning-only exit ! end
- R2 (Pattern 4)
configure terminal ! router bgp 20 neighbor 100.1.2.1 maximum-prefix 19 restart 3 exit ! end
Verification
do ping 100.10.1.1 source 100.20.1.2 do ping 100.10.4.1 source 100.20.1.2 do show ip bgp do show ip bgp neighbors | include BGP state
- Pattern 1
R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#router bgp 10 R1(config-router)#network 100.10.2.0 mask 255.255.255.0 R1(config-router)#network 100.10.3.0 mask 255.255.255.0 R1(config-router)#network 100.10.4.0 mask 255.255.255.0 R1(config-router)#network 100.10.5.0 mask 255.255.255.0 R1(config-router)#network 100.10.6.0 mask 255.255.255.0 R1(config-router)#network 100.10.7.0 mask 255.255.255.0 R1(config-router)#network 100.10.8.0 mask 255.255.255.0 R1(config-router)#network 100.10.9.0 mask 255.255.255.0 R1(config-router)#network 100.10.10.0 mask 255.255.255.0 R1(config-router)#network 100.10.11.0 mask 255.255.255.0 R1(config-router)# *Feb 17 23:25:39.280: %BGP-5-NBR_RESET: Neighbor 100.1.2.2 reset (Peer closed the session) *Feb 17 23:25:39.284: %BGP-5-ADJCHANGE: neighbor 100.1.2.2 Down Peer closed the session *Feb 17 23:25:39.285: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.2 IPv4 Unicast topology base removed from session Peer closed the session R1(config-router)# *Feb 17 23:25:45.836: %BGP-5-NBR_RESET: Neighbor 100.1.2.2 active reset (BGP Notification received) *Feb 17 23:25:45.839: %BGP-5-ADJCHANGE: neighbor 100.1.2.2 active Down BGP Notification received *Feb 17 23:25:45.839: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.2 IPv4 Unicast topology base removed from session BGP Notification received R1(config-router)#
R2(config-router)#
*Feb 17 23:22:28.389: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 8, max 10
R2(config-router)#
*Feb 17 23:24:15.128: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 9, max 10
R2(config-router)#do sh ip bgp
BGP table version is 11, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.10.7.0/24 100.1.2.1 0 0 10 i
*> 100.10.8.0/24 100.1.2.1 0 0 10 i
*> 100.10.9.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#
*Feb 17 23:24:56.774: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 10, max 10
R2(config-router)#do sh ip bgp
BGP table version is 12, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.10.7.0/24 100.1.2.1 0 0 10 i
*> 100.10.8.0/24 100.1.2.1 0 0 10 i
*> 100.10.9.0/24 100.1.2.1 0 0 10 i
*> 100.10.10.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do sh ip bgp neigh | i BGP state
BGP state = Established, up for 00:23:14
R2(config-router)#
*Feb 17 23:25:38.892: %BGP-3-MAXPFXEXCEED: Number of prefixes received from 100.1.2.1 (afi 0): 11 exceeds limit 10
*Feb 17 23:25:38.894: %BGP-3-NOTIFICATION: sent to neighbor 100.1.2.1 6/1 (Maximum Number of Prefixes Reached) 7 bytes 00010100 00000A
R2(config-router)#
*Feb 17 23:25:38.894: %BGP-5-NBR_RESET: Neighbor 100.1.2.1 reset (Peer over prefix limit)
*Feb 17 23:25:38.899: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 Down Peer over prefix limit
*Feb 17 23:25:38.900: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.1 IPv4 Unicast topology base removed from session Peer over prefix limit
R2(config-router)#
*Feb 17 23:25:49.610: %BGP-5-NBR_RESET: Neighbor 100.1.2.1 passive reset (BGP Notification sent)
*Feb 17 23:25:49.615: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 passive Down AFI/SAFI not supported
R2(config-router)#do sh ip bgp neigh | i BGP state
BGP state = Idle
R2(config-router)#do sh ip bgp
BGP table version is 22, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#
*Feb 17 23:26:44.915: %BGP-3-NOTIFICATION: sent to neighbor 100.1.2.1 passive 2/8 (no supported AFI/SAFI) 3 bytes 000101 (timer expired)
R2(config-router)#
- Pattern 2
R1#sh ip bgp
BGP table version is 3, local router ID is 100.10.20.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 0.0.0.0 0 32768 i
*> 100.20.1.0/24 100.1.2.2 0 0 20 i
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#router bgp 10
R1(config-router)#network 100.10.2.0 mask 255.255.255.0
R1(config-router)#network 100.10.3.0 mask 255.255.255.0
R1(config-router)#network 100.10.4.0 mask 255.255.255.0
R1(config-router)#network 100.10.5.0 mask 255.255.255.0
R1(config-router)#network 100.10.6.0 mask 255.255.255.0
R1(config-router)#network 100.10.7.0 mask 255.255.255.0
R1(config-router)#network 100.10.8.0 mask 255.255.255.0
R1(config-router)#network 100.10.9.0 mask 255.255.255.0
R1(config-router)#network 100.10.10.0 mask 255.255.255.0
R1(config-router)#network 100.10.11.0 mask 255.255.255.0
R1(config-router)#
*Feb 17 23:47:50.908: %BGP-5-NBR_RESET: Neighbor 100.1.2.2 reset (Peer closed the session)
*Feb 17 23:47:50.913: %BGP-5-ADJCHANGE: neighbor 100.1.2.2 Down Peer closed the session
*Feb 17 23:47:50.914: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.2 IPv4 Unicast topology base removed from session Peer closed the session
R1(config-router)#
*Feb 17 23:47:57.098: %BGP-5-NBR_RESET: Neighbor 100.1.2.2 active reset (BGP Notification received)
*Feb 17 23:47:57.101: %BGP-5-ADJCHANGE: neighbor 100.1.2.2 active Down BGP Notification received
*Feb 17 23:47:57.102: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.2 IPv4 Unicast topology base removed from session BGP Notification received
R1(config-router)#
*Feb 17 23:48:57.502: %BGP-3-NOTIFICATION: received from neighbor 100.1.2.2 active 2/8 (no supported AFI/SAFI) 3 bytes 000101 (timer expired)
R1(config-router)#
R2#sh ip bgp
BGP table version is 3, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#router bgp 20
R2(config-router)#neigh
R2(config-router)#neighbor 100.1.2.1 maxi
R2(config-router)#neighbor 100.1.2.1 maximum-prefix 10 50
R2(config-router)#do pingdo ping 100.10.4.1 source 100.20.1.2
^
% Invalid input detected at '^' marker.
R2(config-router)#do ping 100.10.4.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.4.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
.....
Success rate is 0 percent (0/5)
R2(config-router)#do ping 100.10.1.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.1.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/4/6 ms
R2(config-router)#show ip bgp
^
% Invalid input detected at '^' marker.
R2(config-router)#do show ip bgp
BGP table version is 3, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp neighbors | include BGP state
BGP state = Established, up for 00:11:49
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 4, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 6, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 7, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 7, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
BGP table version is 7, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
*Feb 17 23:44:47.243: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 6, max 10
R2(config-router)#do show ip bgp
BGP table version is 8, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
*Feb 17 23:45:18.016: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 7, max 10
R2(config-router)#do show ip bgp
BGP table version is 12, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.10.7.0/24 100.1.2.1 0 0 10 i
*> 100.10.8.0/24 100.1.2.1 0 0 10 i
*> 100.10.9.0/24 100.1.2.1 0 0 10 i
*> 100.10.10.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do ping 100.10.1.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.1.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/4/7 ms
R2(config-router)#do ping 100.10.5.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.5.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/5 ms
R2(config-router)#do ping 100.10.10.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.10.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/4/6 ms
R2(config-router)#
*Feb 17 23:47:50.584: %BGP-3-MAXPFXEXCEED: Number of prefixes received from 100.1.2.1 (afi 0): 11 exceeds limit 10
*Feb 17 23:47:50.586: %BGP-3-NOTIFICATION: sent to neighbor 100.1.2.1 6/1 (Maximum Number of Prefixes Reached) 7 bytes 00010100 00000A
*Feb 17 23:47:50.586: %BGP-5-NBR_RESET: Neighbor 100.1.2.1 reset (Peer over prefix limit)
*Feb 17 23:47:50.592: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 Down Peer over prefix limit
*Feb 17 23:47:50.592: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.1 IPv4 Unicast topology base removed from session Peer over prefix limit
R2(config-router)#
*Feb 17 23:48:01.643: %BGP-5-NBR_RESET: Neighbor 100.1.2.1 passive reset (BGP Notification sent)
*Feb 17 23:48:01.646: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 passive Down AFI/SAFI not supported
R2(config-router)#do show ip bgp
BGP table version is 22, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp neighbors | include BGP state
BGP state = Idle
R2(config-router)#do ping 100.10.10.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.10.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
.....
Success rate is 0 percent (0/5)
R2(config-router)#
*Feb 17 23:48:57.020: %BGP-3-NOTIFICATION: sent to neighbor 100.1.2.1 passive 2/8 (no supported AFI/SAFI) 3 bytes 000101 (timer expired)
R2(config-router)#
- Pattern 3
R1(config-router)# *Feb 17 23:51:08.444: %BGP-5-ADJCHANGE: neighbor 100.1.2.2 Up R1(config-router)#network 100.10.12.0 mask 255.255.255.0 R1(config-router)#network 100.10.13.0 mask 255.255.255.0 R1(config-router)#network 100.10.14.0 mask 255.255.255.0 R1(config-router)#network 100.10.15.0 mask 255.255.255.0 R1(config-router)#network 100.10.16.0 mask 255.255.255.0 R1(config-router)#network 100.10.17.0 mask 255.255.255.0 R1(config-router)#network 100.10.18.0 mask 255.255.255.0 R1(config-router)#network 100.10.19.0 mask 255.255.255.0 R1(config-router)#network 100.10.20.0 mask 255.255.255.0 R1(config-router)#
R2(config-router)#neighbor 100.1.2.1 maximum-prefix 19 warning-only
R2(config-router)#do
*Feb 17 23:51:08.174: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 Up
R2(config-router)#do ping 100.10.10.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.10.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/3/4 ms
R2(config-router)#do show ip bgp neighbors | include BGP state
BGP state = Established, up for 00:00:17
R2(config-router)#do show ip bgp
BGP table version is 33, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.10.7.0/24 100.1.2.1 0 0 10 i
*> 100.10.8.0/24 100.1.2.1 0 0 10 i
*> 100.10.9.0/24 100.1.2.1 0 0 10 i
*> 100.10.10.0/24 100.1.2.1 0 0 10 i
*> 100.10.11.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#
*Feb 17 23:52:08.674: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 15, max 19
R2(config-router)#
*Feb 17 23:52:08.676: %BGP-3-MAXPFXEXCEED: Number of prefixes received from 100.1.2.1 (afi 0): 20 exceeds limit 19
R2(config-router)#do show ip bgp
BGP table version is 42, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.10.7.0/24 100.1.2.1 0 0 10 i
*> 100.10.8.0/24 100.1.2.1 0 0 10 i
*> 100.10.9.0/24 100.1.2.1 0 0 10 i
*> 100.10.10.0/24 100.1.2.1 0 0 10 i
*> 100.10.11.0/24 100.1.2.1 0 0 10 i
*> 100.10.12.0/24 100.1.2.1 0 0 10 i
*> 100.10.13.0/24 100.1.2.1 0 0 10 i
*> 100.10.14.0/24 100.1.2.1 0 0 10 i
Network Next Hop Metric LocPrf Weight Path
*> 100.10.15.0/24 100.1.2.1 0 0 10 i
*> 100.10.16.0/24 100.1.2.1 0 0 10 i
*> 100.10.17.0/24 100.1.2.1 0 0 10 i
*> 100.10.18.0/24 100.1.2.1 0 0 10 i
*> 100.10.19.0/24 100.1.2.1 0 0 10 i
*> 100.10.20.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do ping 100.10.20.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.20.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/5 ms
R2(config-router)#
- Pattern 4
R1(config-router)#
*Feb 17 23:55:59.501: %BGP-3-NOTIFICATION: received from neighbor 100.1.2.2 active 2/8 (no supported AFI/SAFI) 3 bytes 000101 (timer expired)
R1(config-router)#no network 100.10.20.0 mask 255.255.255.0
R1(config-router)#
R1(config-router)#
R1(config-router)#
R1(config-router)#
R1(config-router)#
R1(config-router)#
R1(config-router)#no network 100.10.20.0 mask 255.255.255.0
R1(config-router)#sh clock
^
% Invalid input detected at '^' marker.
R1(config-router)#do sh clock
*23:57:49.697 UTC Sun Feb 17 2019
R1(config-router)#
*Feb 18 00:04:50.306: %BGP-5-ADJCHANGE: neighbor 100.1.2.2 Up
R1(config-router)#
R2(config-router)#neighbor 100.1.2.1 maximum-prefix 19 restart ?
<1-65535> Restart interval in minutes
R2(config-router)#neighbor 100.1.2.1 maximum-prefix 19 restart 10
R2(config-router)#
*Feb 17 23:54:52.929: %BGP-3-MAXPFXEXCEED: Number of prefixes received from 100.1.2.1 (afi 0): 20 exceeds limit 19
*Feb 17 23:54:52.931: %BGP-3-NOTIFICATION: sent to neighbor 100.1.2.1 6/1 (Maximum Number of Prefixes Reached) 7 bytes 00010100 000013
R2(config-router)#
*Feb 17 23:54:52.945: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 Down Peer over prefix limit
*Feb 17 23:54:52.946: %BGP_SESSION-5-ADJCHANGE: neighbor 100.1.2.1 IPv4 Unicast topology base removed from session Peer over prefix limit
R2(config-router)#do sh clo
*Feb 17 23:55:02.898: %BGP-5-NBR_RESET: Neighbor 100.1.2.1 passive reset (BGP Notification sent)
*Feb 17 23:55:02.902: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 passive Down AFI/SAFI not supported
R2(config-router)#do sh clock
*23:55:04.679 UTC Sun Feb 17 2019
R2(config-router)#do sh clock
*23:55:18.513 UTC Sun Feb 17 2019
R2(config-router)#do show ip bgp
BGP table version is 62, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do show ip bgp
*Feb 17 23:55:58.206: %BGP-3-NOTIFICATION: sent to neighbor 100.1.2.1 passive 2/8 (no supported AFI/SAFI) 3 bytes 000101 (timer expired)
R2(config-router)#do show ip bgp neighbors | include BGP state
BGP state = Idle
R2(config-router)#do sh clock
*23:56:15.498 UTC Sun Feb 17 2019
R2(config-router)#do ping 100.10.20.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.20.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
....
Success rate is 0 percent (0/4)
R2(config-router)#do ping 100.10.15.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.15.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
.....
Success rate is 0 percent (0/5)
R2(config-router)#do sh clock
*23:57:54.086 UTC Sun Feb 17 2019
R2(config-router)#
*Feb 18 00:04:49.854: %BGP-5-ADJCHANGE: neighbor 100.1.2.1 Up
R2(config-router)#
*Feb 18 00:04:49.877: %BGP-4-MAXPFX: Number of prefixes received from 100.1.2.1 (afi 0) reaches 15, max 19
R2(config-router)#do sh clock
*00:06:04.003 UTC Mon Feb 18 2019
R2(config-router)#do show ip bgp neighbors | include BGP state
BGP state = Established, up for 00:01:25
R2(config-router)#do show ip bgp
BGP table version is 81, local router ID is 100.20.1.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 100.10.1.0/24 100.1.2.1 0 0 10 i
*> 100.10.2.0/24 100.1.2.1 0 0 10 i
*> 100.10.3.0/24 100.1.2.1 0 0 10 i
*> 100.10.4.0/24 100.1.2.1 0 0 10 i
*> 100.10.5.0/24 100.1.2.1 0 0 10 i
*> 100.10.6.0/24 100.1.2.1 0 0 10 i
*> 100.10.7.0/24 100.1.2.1 0 0 10 i
*> 100.10.8.0/24 100.1.2.1 0 0 10 i
*> 100.10.9.0/24 100.1.2.1 0 0 10 i
*> 100.10.10.0/24 100.1.2.1 0 0 10 i
*> 100.10.11.0/24 100.1.2.1 0 0 10 i
*> 100.10.12.0/24 100.1.2.1 0 0 10 i
*> 100.10.13.0/24 100.1.2.1 0 0 10 i
*> 100.10.14.0/24 100.1.2.1 0 0 10 i
Network Next Hop Metric LocPrf Weight Path
*> 100.10.15.0/24 100.1.2.1 0 0 10 i
*> 100.10.16.0/24 100.1.2.1 0 0 10 i
*> 100.10.17.0/24 100.1.2.1 0 0 10 i
*> 100.10.18.0/24 100.1.2.1 0 0 10 i
*> 100.10.19.0/24 100.1.2.1 0 0 10 i
*> 100.20.1.0/24 0.0.0.0 0 32768 i
R2(config-router)#do ping 100.10.15.1 source 100.20.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.10.15.1, timeout is 2 seconds:
Packet sent with a source address of 100.20.1.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 3/3/5 ms
R2(config-router)#
References
tech/network/cisco/bgp/bgp/maximum-prefix/maximum-prefix.txt · Last modified: 2019/02/18 09:21 by wnoguchi
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