Enterasys Networks X-PeditionTM Configuring BGP Neighbors, BGP Path Filtering by Neighbor Example

Configuring BGP Route Maps

XSR(config-router)#neighbor 192.168.57.4 remote-as 200

XSR(config-router)#neighbor 192.168.57.4 route-map 77 out

XSR(config-router)#route-map 77 5 permit

XSR(config-route-map)#set as-path prepend 100

XSR(config-route-map)#match ip address 12

XSR(config-route-map)#route-map 77 15 permit XSR(config-route-map)#match ip address 2 XSR(config-route-map)#access-list 2 permit any XSR(config-route-map)#access-list 12 permit 230.57.10.0 0.255.255.255 XSR(config-route-map)#access-list 12 permit 231.57.10.0 0.255.255.255 XSR(config-route-map)#access-list 12 permit 0.0.0.0 255.255.255.255

Incoming route-maps can perform prefix-based matching and set various update values. Inbound prefix matching is provided in addition to as-pathand community-listmatching. In the following example, the set local preference command sets the local preference of the inbound prefix 230.57.5.0/16 to 95.

XSR(config)#router bgp 13 XSR(config-router)#network 192.168.0.0 XSR(config-router)#neighbor 192.168.1.1 remote-as 47 XSR(config-router)#neighbor 192.168.1.1 route-map 33 in ! XSR(config-router)#route-map 33 permit 5 XSR(config-route-map)#match ip address 2 XSR(config-route-map)#set local preference 95 XSR(config-route-map)#route-map 33 permit 9 XSR(config-route-map)#access-list 2 permit 230.57.5.0

XSR(config-route-map)#access-list 20.255.255.255 access-list 2 deny any

Configuring BGP Neighbors

This example configures a BGP router for AS 33 including two originating networks and three remote XSR’s. The XSR at AS 33 will share data about networks 125.99.0.0 and 192.168.57.0 with its neighbors. The first router listed exists in a different AS; the second is an internal neighbor (AS 33) at address 125.99.28.2; and the third neighbor also exists on a different AS.

Note that the inside BGP neighbor is not directly linked to XSR A. External neighbors (in AS 22 and AS 44) must be linked directly to Router A.

XSR(config)#router bgp 33

XSR(router-config)#network 125.99.0.0

XSR(router-config)#network 192.168.57.0

XSR(router-config)#neighbor 125.99.27.1 remote-as 22

XSR(router-config)#neighbor 125.99.28.2 remote-as 33

XSR(router-config)#neighbor 212.106.53.9 remote-as 44

BGP Path Filtering by Neighbor Example

This example configures BGP path filtering by neighbor where only routes permitted by as-path ACL 2 will be sent to 192.168.57.69. In the same fashion, only routes passing ACL 3 will be permitted from 192.168.57.69.

XSR(config)#router bgp 7

XSR(config-router)#neighbor 192.168.57.69 remote-as 100

XSR User’s Guide 6-23