Cisco dual BGP with Metric (Redundancy)
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[Traffic flow]
[CPE/Customer Cisco Router]
Current configuration:
!
version 12.x
!
hostname CPE
!
interface Ethernet0
description to Internal network
ip address 10.1.0.1 255.255.255.0ip address 10.1.0.129 255.255.255.128 secondaryno ip directed-broadcast
no ip mroute-cache
!
interface Serial0
description to ISP A – WAN 1
ip address 12.1.3.1 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
interface Serial1
description to ISP A – WAN 2ip address 12.1.4.1 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
router bgp 10
no auto-summarynetwork 10.1.0.0 mask 255.255.255.0neighbor 12.1.3.2 remote-as 20
neighbor 12.1.3.2 version 4
neighbor 12.1.4.2 remote-as 20
neighbor 12.1.4.2 version 4neighbor 12.1.4.2 prefix-list 1 out
neighbor 12.1.4.2 route-map shadow_inbound inneighbor 12.1.4.2 route-map shadow_outbound out!
ip classless
!ip prefix-list 1 seq 5 permit 10.1.0.0/24 le 32
!
route-map shadow_inbound permit 10
set local-preference 80
!
route-map shadow_outbound permit 10
set metric 200
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
[PE1 / ISP Cisco Router]
Current configuration:
!
version 12.x
!
hostname PE!
!
interface Serial0
description to WAN 1
ip address 12.1.3.2 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
!
router bgp 20
no auto-summary
neighbor 12.1.3.1 remote-as 10
neighbor 12.1.3.1 version 4
neighbor 12.1.3.1 default-originate <—to send a default route
neighbor 12.1.3.1 distribute-list 2 out
!
ip classless
!access-list 2 permit 100.100.100.0 0.0.0.255!line con 0
line aux 0
line vty 0 4
login
!
end
!
version 12.x
!
hostname PE
!
interface Serial1
description to WAN 2
no ip mroute-cache
no ip directed-broadcast
no fair-queue
!
no auto-summary
neighbor 12.1.4.1 remote-as 10
neighbor 12.1.4.1 version 4
neighbor 12.1.4.1 default-originate <—to send a default route
!
ip classless
!
!
line con 0
line aux 0
line vty 0 4
login
!
end
[Verifing output]
CPE# show ip bgp neighbors 12.1.3.2 ad
BGP table version is 4, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 0.0.0.0 0 32768 iTotal number of prefixes 1
CPE#CPE# show ip bgp neighbors 12.1.4.2 ad
BGP table version is 4, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 0.0.0.0 0 32768 iTotal number of prefixes 1
CPE#CPE# show ip bgp neighbors 12.1.3.2 ro
BGP table version is 4, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 12.1.3.2 0 0 20 i
*> 100.100.100.0/24 12.1.3.2 0 20 ?Total number of prefixes 2
CPE#
CPE# show ip bgp neighbors 12.1.4.2 ro
BGP table version is 4, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
* 0.0.0.0 12.1.4.2 0 80 0 20 i
* 100.100.100.0/24 12.1.4.2 80 0 20 ?Total number of prefixes 2
CPE#PE1#show ip bgp nei 12.1.3.1 ro
BGP table version is 33, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 12.1.3.1 0 0 10 iTotal number of prefixes 1
PE1#PE2#show ip bgp nei 12.1.4.1 ro
BGP table version is 44, local router ID is 4.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
r RIB-failure, S Stale
Origin codes: i – IGP, e – EGP, ? – incompleteNetwork Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 12.1.4.1 200 0 10 iTotal number of prefixes 1
PE2#
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