tech:network:cisco:bgp:bgp:weight:weight
Table of Contents
BGP: WEIGHT
Topology
Project name: ccna-bgp22-weight-topology
IP
- 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 100.0.0.1 255.255.0.0 no shutdown exit interface GigabitEthernet 0/0 ip address 1.2.0.1 255.255.255.0 no shutdown exit interface GigabitEthernet 0/1 ip address 1.3.0.1 255.255.255.0 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 GigabitEthernet 0/0 ip address 2.4.0.2 255.255.255.0 no shutdown exit interface GigabitEthernet 0/1 ip address 1.2.0.2 255.255.255.0 no shutdown exit ! end write
- R3
enable configure terminal ! hostname R3 no ip domain-lookup line console 0 exec-timeout 0 0 logging synchronous exit ! interface GigabitEthernet 0/0 ip address 1.3.0.3 255.255.255.0 no shutdown exit interface GigabitEthernet 0/1 ip address 3.4.0.3 255.255.255.0 no shutdown exit ! end write
- R4
enable configure terminal ! hostname R4 no ip domain-lookup line console 0 exec-timeout 0 0 logging synchronous exit ! interface Loopback 1 ip address 40.0.0.4 255.255.0.0 no shutdown exit interface GigabitEthernet 0/0 ip address 3.4.0.4 255.255.255.0 no shutdown exit interface GigabitEthernet 0/1 ip address 2.4.0.4 255.255.255.0 no shutdown exit ! end write
BGP
Project name: ccna-bgp23-weight
- R1
enable configure terminal ! router bgp 10 neighbor 1.2.0.2 remote-as 20 neighbor 1.3.0.3 remote-as 30 network 100.0.0.0 mask 255.255.0.0 exit ! end write
- R2
enable configure terminal ! router bgp 20 neighbor 1.2.0.1 remote-as 10 neighbor 2.4.0.4 remote-as 40 exit ! end write
- R3
enable configure terminal ! router bgp 30 neighbor 1.3.0.1 remote-as 10 neighbor 3.4.0.4 remote-as 40 exit ! end write
- R4
enable configure terminal ! router bgp 40 neighbor 2.4.0.2 remote-as 20 neighbor 3.4.0.3 remote-as 30 network 40.0.0.0 mask 255.255.0.0 exit ! end write
- neighbor
- route-map ACL, Prefix
- route-map AS_PATH
- filter-list
✔configure weight by neighbor
- R1
enable configure terminal ! router bgp 10 neighbor 1.2.0.2 weight 100 neighbor 1.3.0.3 weight 200 exit ! end
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip ro bgp
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
40.0.0.0/16 is subnetted, 1 subnets
B 40.0.0.0 [20/0] via 1.2.0.2, 23:50:35
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#router bgp 10
R1(config-router)#neigh
R1(config-router)#neighbor 1.2.0.2 wei
R1(config-router)#neighbor 1.2.0.2 weight 100
R1(config-router)#nei
R1(config-router)#neighbor 1.3.0.3 wei
R1(config-router)#neighbor 1.3.0.3 weight 200
R1(config-router)#^Z
R1#
*Jan 26 05:07:50.167: %SYS-5-CONFIG_I: Configured from console by console
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh run | sec bgp 10
router bgp 10
bgp log-neighbor-changes
network 100.0.0.0 mask 255.255.0.0
neighbor 1.2.0.2 remote-as 20
neighbor 1.2.0.2 weight 100
neighbor 1.3.0.3 remote-as 30
neighbor 1.3.0.3 weight 200
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#clear ip bgp re
R1#clear ip bgp ?
* Clear all peers
<1-4294967295> Clear peers with the AS number
<1.0-XX.YY> Clear peers with the AS number
A.B.C.D BGP neighbor address to clear
X:X:X:X::X BGP neighbor address to clear
all All address families
dampening Clear route flap dampening information
external Clear all external peers
flap-statistics Clear route flap statistics
internal Clear BGP internal statistics counters
ipv4 Address family
ipv6 Address family
l2vpn Address family
nsap Address family
peer-group Clear all members of peer-group
rtfilter Address family
sso SSO related
table-map Update BGP table-map configuration
topology Routing topology instance
update-group Clear all members of update-group
vpnv4 Address family
vpnv6 Address family
R1#clear ip bgp so
R1#clear ip bgp sof
R1#clear ip bgp sof
R1#clear ip bgp sof
R1#clear ip bgp ?
* Clear all peers
<1-4294967295> Clear peers with the AS number
<1.0-XX.YY> Clear peers with the AS number
A.B.C.D BGP neighbor address to clear
X:X:X:X::X BGP neighbor address to clear
all All address families
dampening Clear route flap dampening information
external Clear all external peers
flap-statistics Clear route flap statistics
internal Clear BGP internal statistics counters
ipv4 Address family
ipv6 Address family
l2vpn Address family
nsap Address family
peer-group Clear all members of peer-group
rtfilter Address family
sso SSO related
table-map Update BGP table-map configuration
topology Routing topology instance
update-group Clear all members of update-group
vpnv4 Address family
vpnv6 Address family
R1#clear ip bgp * so
R1#clear ip bgp * soft ?
in Soft reconfig inbound updates
out Soft reconfig outbound updates
slow Forcefully clear slow-peer status and move it to original update group
<cr>
R1#clear ip bgp * soft in
R1#sh ip bgp
BGP table version is 5, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.2.0.2 100 20 40 i
*> 1.3.0.3 200 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#
R1#sh ip ro bgp
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
40.0.0.0/16 is subnetted, 1 subnets
B 40.0.0.0 [20/0] via 1.3.0.3, 00:00:43
R1#ping 40.0.0.4 sour
R1#ping 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.0.0.4, timeout is 2 seconds:
Packet sent with a source address of 100.0.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/6 ms
R1#traceroute 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Tracing the route to 40.0.0.4
VRF info: (vrf in name/id, vrf out name/id)
1 1.3.0.3 6 msec 3 msec 3 msec
2 3.4.0.4 6 msec 5 msec 5 msec
✔configure weight by route-map ACL
- R1
enable configure terminal ! access-list 1 permit 40.0.0.0 0.0.255.255 ! route-map R-WEIGHT-R2 permit 10 match ip address 1 set weight 100 exit route-map R-WEIGHT-R2 permit 20 exit ! route-map R-WEIGHT-R3 permit 10 match ip address 1 set weight 200 exit route-map R-WEIGHT-R3 permit 20 exit ! router bgp 10 neighbor 1.2.0.2 route-map R-WEIGHT-R2 in neighbor 1.3.0.3 route-map R-WEIGHT-R3 in exit ! end
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#acc
R1(config)#access-list 1 per
R1(config)#acc
R1(config)#access-list 1 per
R1(config)#access-list 1 permit 40.0.0.0 0.0.255.255
R1(config)#route-ma
R1(config)#route-map R-WEIGHT-R2 permit 10
R1(config-route-map)#mat
R1(config-route-map)#match ip add
R1(config-route-map)#match ip address 1
R1(config-route-map)#set wei
R1(config-route-map)#set weight ?
<0-65535> Weight value
R1(config-route-map)#set weight 100
R1(config-route-map)#route-map R-WEIGHT 20
R1(config-route-map)#route-map R-WEIGHT per
R1(config-route-map)#route-map R-WEIGHT permit 20
R1(config-route-map)#do sh run | s route-map 20
R1(config-route-map)#do sh run | s route-map
route-map R-WEIGHT-R2 permit 10
match ip address 1
set weight 100
route-map R-WEIGHT permit 20
R1(config-route-map)#no route-map R-WEIGHT permit 20
R1(config)#route-map R-WEIGHT-R2 per
R1(config)#route-map R-WEIGHT-R2 permit ?
<0-65535> Sequence to insert to/delete from existing route-map entry
<cr>
R1(config)#route-map R-WEIGHT-R2 ?
<0-65535> Sequence to insert to/delete from existing route-map entry
deny Route map denies set operations
permit Route map permits set operations
<cr>
R1(config)#route-map R-WEIGHT-R2 per
R1(config)#route-map R-WEIGHT-R2 permit ?
<0-65535> Sequence to insert to/delete from existing route-map entry
<cr>
R1(config)#route-map R-WEIGHT-R2 permit 20
R1(config-route-map)#route-map R-WEIGHT-R3 per
R1(config-route-map)#route-map R-WEIGHT-R3 permit 10
R1(config-route-map)#mat
R1(config-route-map)#match ip add
R1(config-route-map)#match ip address 1
R1(config-route-map)#set wei
R1(config-route-map)#set weight 200
R1(config-route-map)#rout
R1(config-route-map)#route-
R1(config-route-map)#route-ma
R1(config-route-map)#route-map R-WEIGHT-R3 permit 20
R1(config-route-map)#router bgp 10
R1(config-router)#do sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 0 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#do clear ip bgp soft * in
^
% Invalid input detected at '^' marker.
R1(config-router)#do clear ip bgp ?
% Unrecognized command
R1(config-router)#do clear b
R1(config-router)#do clear bgp ?
% Unrecognized command
R1(config-router)#do clear ?
% Unrecognized command
R1(config-router)#do cl>?
% Unrecognized command
R1(config-router)#^Z
R1#
*Jan 27 10:57:38.533: %SYS-5-CONFIG_I: Configured from console by console
R1#clear ip
R1#clear ip b
R1#clear ip bgp so
R1#clear ip bgp * sof
R1#clear ip bgp * soft i
R1#clear ip bgp * soft in
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 0 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#router bgp 10
R1(config-router)#neigh
R1(config-router)#neighbor 1.2.0.2 route
R1(config-router)#neighbor 1.2.0.2 route-ma
R1(config-router)#neighbor 1.2.0.2 route-map R-WEI
R1(config-router)#neighbor 1.2.0.2 route-map R-WEIGH
R1(config-router)#neighbor 1.2.0.2 route-map R-WEIGHT-R2 in
R1(config-router)#do sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 0 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#do sh clear ip bgp * soft in
^
% Invalid input detected at '^' marker.
R1(config-router)#do clear ip bgp * soft in
R1(config-router)#do clear ip bgp * soft ?
% Unrecognized command
R1(config-router)#do sh ip bgp
BGP table version is 4, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 100 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#neigh
R1(config-router)#neighbor 1.3.0.3 route-ma
R1(config-router)#neighbor 1.3.0.3 route-map R-WEIGHT-R3 in
R1(config-router)#do sh ip bgp
BGP table version is 4, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 100 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#do clear ip bgp * soft in
R1(config-router)#do sh ip bgp
BGP table version is 5, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.3.0.3 200 30 40 i
* 1.2.0.2 100 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#do sh ip bgp
BGP table version is 5, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.3.0.3 200 30 40 i
* 1.2.0.2 100 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#
R1(config-router)#do ping 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.0.0.4, timeout is 2 seconds:
Packet sent with a source address of 100.0.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 5/6/9 ms
R1(config-router)#do trace 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Tracing the route to 40.0.0.4
VRF info: (vrf in name/id, vrf out name/id)
1 1.3.0.3 4 msec 3 msec 4 msec
2 3.4.0.4 4 msec 5 msec 5 msec
✔configure weight by route-map ip prefix-list
- R1
enable configure terminal ! ip prefix-list PRE-R4 permit 40.0.0.0/16 ! route-map R-WEIGHT-R2 permit 10 match ip address prefix-list PRE-R4 set weight 345 exit route-map R-WEIGHT-R2 permit 20 exit ! route-map R-WEIGHT-R3 permit 10 match ip address prefix-list PRE-R4 set weight 123 exit route-map R-WEIGHT-R3 permit 20 exit ! router bgp 10 neighbor 1.2.0.2 route-map R-WEIGHT-R2 in neighbor 1.3.0.3 route-map R-WEIGHT-R3 in exit ! end
sh ip bgp clear ip bgp * soft in sh ip bgp ping 40.0.0.4 source 100.0.0.1 traceroute 40.0.0.4 source 100.0.0.1
✔configure weight by route-map as-path
- R1
enable configure terminal ! ip as-path access-list 1 permit ^20_ ip as-path access-list 2 permit ^30_ ! route-map R-WEIGHT-R2 permit 10 match as-path 1 set weight 111 exit route-map R-WEIGHT-R2 permit 20 exit ! route-map R-WEIGHT-R3 permit 10 match as-path 2 set weight 222 exit route-map R-WEIGHT-R3 permit 20 exit ! router bgp 10 neighbor 1.2.0.2 route-map R-WEIGHT-R2 in neighbor 1.3.0.3 route-map R-WEIGHT-R3 in exit ! end
! before sh ip bgp ping 40.0.0.4 source 100.0.0.1 traceroute 40.0.0.4 source 100.0.0.1 clear ip bgp * soft in ! after sh ip bgp ping 40.0.0.4 source 100.0.0.1 traceroute 40.0.0.4 source 100.0.0.1
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#ip as-path acc
R1(config)#ip as-path access-list 1 permi
R1(config)#ip as-path access-list 1 permit ^20_
R1(config)#ip as-pa
R1(config)#ip as-path acc
R1(config)#ip as-path access-list 2 permi
R1(config)#ip as-path access-list 2 permit ^30_
R1(config)#route-ma
R1(config)#route-map R-WEIGHT-R2 permit 10
R1(config-route-map)#mat
R1(config-route-map)#match as-pa
R1(config-route-map)#match as-path 1
R1(config-route-map)#do sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 0 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-route-map)#set weight 111
R1(config-route-map)#exit
R1(config)#route-map R-WEIGHT-R2 permit 20
R1(config-route-map)#route-map R-WEIGHT-R3 permit 10
R1(config-route-map)#match as
R1(config-route-map)#match as-path 2
R1(config-route-map)#set wei
R1(config-route-map)#set weight 222
R1(config-route-map)#route-map R-WEIGHT-R3 permit 20
R1(config-route-map)#router bgp 10
R1(config-router)#neighbor 1.2.0.2 route-
R1(config-router)#neighbor 1.2.0.2 route-ma
R1(config-router)#neighbor 1.2.0.2 route-map R-WEIGHT-R2 in
R1(config-router)#neigh
R1(config-router)#neighbor 1.3.0.3 route-map R-WEIGHT-R3 in
R1(config-router)#^Z
R1#
*Feb 10 06:28:41.376: %SYS-5-CONFIG_I: Configured from console by console
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.3.0.3 0 30 40 i
*> 1.2.0.2 0 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#ping 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.0.0.4, timeout is 2 seconds:
Packet sent with a source address of 100.0.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 5/5/8 ms
R1#traceroute 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Tracing the route to 40.0.0.4
VRF info: (vrf in name/id, vrf out name/id)
1 1.2.0.2 5 msec 4 msec 4 msec
2 2.4.0.4 5 msec 6 msec 5 msec
R1#clear ip bgp * soft in
R1#sh ip bgp
BGP table version is 5, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.3.0.3 222 30 40 i
* 1.2.0.2 111 20 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#ping 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.0.0.4, timeout is 2 seconds:
Packet sent with a source address of 100.0.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/5 ms
R1#traceroute 40.0.0.4 sour
R1#traceroute 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Tracing the route to 40.0.0.4
VRF info: (vrf in name/id, vrf out name/id)
1 1.3.0.3 5 msec 5 msec 5 msec
2 3.4.0.4 5 msec 7 msec 5 msec
R1#
✗configure weight by filter-list ?
I'm not sure following configuration is correct…
where is filter-list, route-map take effect…?
- R1
enable configure terminal ! ip as-path access-list 1 permit ^20_ ip as-path access-list 2 permit ^30_ ! router bgp 10 neighbor 1.2.0.2 filter-list 1 in neighbor 1.2.0.2 weight 321 neighbor 1.3.0.3 rfilter-list 2 in neighbor 1.2.0.3 weight 876 exit ! end
! before sh ip bgp ping 40.0.0.4 source 100.0.0.1 traceroute 40.0.0.4 source 100.0.0.1 clear ip bgp * soft in ! after sh ip bgp ping 40.0.0.4 source 100.0.0.1 traceroute 40.0.0.4 source 100.0.0.1
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#ip as-pa
R1(config)#ip as-path acc
R1(config)#ip as-path access-list 1 permi
R1(config)#ip as-path access-list 1 permit ^20_
R1(config)#ip as
R1(config)#ip as-path acc
R1(config)#ip as-path access-list 2 permi
R1(config)#ip as-path access-list 2 permit ^30_
R1(config)#router bgp 10
R1(config-router)#neigh
R1(config-router)#neighbor 1.2.0.2 fil
R1(config-router)#neighbor 1.2.0.2 filter-list 1 ?
in Filter incoming routes
out Filter outgoing routes
R1(config-router)#neighbor 1.2.0.2 filter-list ?
<1-500> AS path access list
R1(config-router)#neighbor 1.2.0.2 filter-list 1 ?
in Filter incoming routes
out Filter outgoing routes
R1(config-router)#neighbor 1.2.0.2 filter-list 1 in ?
<cr>
R1(config-router)#neighbor 1.2.0.2 filter-list ?
<1-500> AS path access list
R1(config-router)#neighbor 1.2.0.2 filter-list 1 R-WEIGHT-R2 in
^
% Invalid input detected at '^' marker.
R1(config-router)#neighbor 1.2.0.2 filter-list 1 in
R1(config-router)#neigh
R1(config-router)#do sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1(config-router)#neigh
R1(config-router)#neighbor 1.2.0.2 wei
R1(config-router)#neighbor 1.2.0.2 weight 321
R1(config-router)#nei
R1(config-router)#neighbor 1.2.0.2 wei
R1(config-router)#neighbor 1.3.0.3 nei
R1(config-router)#neighbor 1.3.0.3 filter
R1(config-router)#neighbor 1.3.0.3 filter-list 2 in
R1(config-router)#neg
R1(config-router)#nei
R1(config-router)#neighbor 1.3.0.3 wei
R1(config-router)#neighbor 1.3.0.3 weight 876
R1(config-router)#^Z
R1#
*Feb 10 06:47:42.303: %SYS-5-CONFIG_I: Configured from console by console
R1#sh ip bgp
BGP table version is 3, local router ID is 100.0.0.1
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
*> 40.0.0.0/16 1.2.0.2 0 20 40 i
* 1.3.0.3 0 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#ping 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.0.0.4, timeout is 2 seconds:
Packet sent with a source address of 100.0.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/7 ms
R1#source 40.0.0.4 source 100.0.0.1
^
% Invalid input detected at '^' marker.
R1#traceroute 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Tracing the route to 40.0.0.4
VRF info: (vrf in name/id, vrf out name/id)
1 1.2.0.2 5 msec 4 msec 3 msec
2 2.4.0.4 6 msec 5 msec 6 msec
R1#clear ip bgp * soft in
R1#sh ip bgp
BGP table version is 4, local router ID is 100.0.0.1
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
* 40.0.0.0/16 1.2.0.2 321 20 40 i
*> 1.3.0.3 876 30 40 i
*> 100.0.0.0/16 0.0.0.0 0 32768 i
R1#ping 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40.0.0.4, timeout is 2 seconds:
Packet sent with a source address of 100.0.0.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 5/6/7 ms
R1#traceroute 40.0.0.4 source 100.0.0.1
Type escape sequence to abort.
Tracing the route to 40.0.0.4
VRF info: (vrf in name/id, vrf out name/id)
1 1.3.0.3 6 msec 5 msec 3 msec
2 3.4.0.4 4 msec 6 msec 7 msec
R1#
References
tech/network/cisco/bgp/bgp/weight/weight.txt · Last modified: 2019/02/10 15:51 by wnoguchi
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