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Figure 18: Advertising a Route When Another Route is Present

The following commands represent a partial configuration of router R2:

host1(config)#router bgp 200

host1(config-router)#address-family ipv4 unicast

host1(config-router-af)#neighbor 10.2.0.1 remote-as 100

host1(config-router-af)#neighbor 10.2.0.1 advertise-map advertisetoR1 exist-map trigger1

sequence 10

host1(config-router-af)#neighbor 10.2.0.1 advertise-map alternatetoR1 exist-map trigger2

host1(config-router-af)#exit

host1(config-router)#exit

!Configure route map to send one route to R1

host1(config)#access-list 77 permit 10.10.20.0 0.0.0.255

host1(config)#route-map advertisetoR1 permit 10

host1(config-route-map)#match ip address 77

host1(config-route-map)#exit

!Configure route map to match one trigger route from R3

host1(config)#ip as-path access-list 1 permit ^300

host1(config)#access-list 70 permit 172.24.19.0 0.0.0.255

host1(config)#route-map trigger1 permit 10

host1(config-route-map)#match ip address 70

host1(config-route-map)#match as-path 1

host1(config-route-map)#exit

!Configure route map to send alternate route to R1

host1(config)#access-list test permit 10.10.30.0 0.0.0.255

host1(config)#route-map alternatetoR1 permit 10

host1(config-route-map)#match ip address test

host1(config-route-map)#exit

!Configure route map to match alternate route from R3

host1(config)#access-list check permit 172.24.20.0 0.0.0.255

host1(config)#route-map trigger2 permit 10

host1(config-route-map)#match ip address check

host1(config-route-map)#exit

JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

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