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Configuring BGP
BGP Configuration Examples
IPC-335
Cisco IOS IP Configuration Guide
Inbound route maps could perform prefix-based matching and set various parameters of the update.
Inbound prefix matching is available in addition to autonomous system path and community list
matching. The following example shows how the set local-preference route-map configuration
command sets the local preference of the inbound prefix 140.10.0.0/16 to 120:
!
router bgp 100
network 131.108.0.0
neighbor 131.108.1.1 remote-as 200
neighbor 131.108.1.1 route-map set-local-pref in
!
route-map set-local-pref permit 10
match ip address 2
set local preference 120
!
route-map set-local-pref permit 20
!
access-list 2 permit 140.10.0.0 0.0.255.255
access-list 2 deny any
The following examples show how to ensure that traffic from one router on a shared LAN will always
be passed through a second router, rather than being sent directly to a third router on the same LAN.
Routers A, B, and C connect to the same LAN. Router A peers with router B, and router B peers with
router C. Router B sends traffic over the routes of router A to router C, but wants to make sure that all
traffic from router C to router A goes through router B, rather than directly from router C to router A
over the shared LAN. This configuration can be useful for traffic accounting purposes or to satisfy the
peering agreement between router C and router B. You can achieve this configuration by using the set
ip next-hop route-map configuration command as shown in the following two examples.
Example one applies an inbound route map on the BGP session of router C with router B.
Router A Configuration
router bgp 100
neighbor 1.1.1.2 remote-as 200
Router B Configuration
router bgp 200
neighbor 1.1.1.1 remote-as 100
neighbor 1.1.1.3 remote-as 300
Router C Configuration
router bgp 300
neighbor 1.1.1.2 remote-as 200
neighbor 1.1.1.2 route-map set-peer-address in
route-map set-peer-address permit 10
set ip next-hop peer-address
The following example applies an outbound route map on the BGP session of router B with router C:
Router A Configuration
router bgp 100
neighbor 1.1.1.2 remote-as 200
Router B Configuration
router bgp 200
neighbor 1.1.1.1 remote-as 100