29.5.10 Configuration of BGP4 + learned route limit

(1) List of configuration commands

The following tables list the commands used to configure BGP4 + learned routes limit.

Table 29-18: List of configuration commands

Command name	Description
neighbor maximum-prefix	Limits the number of routes that can be learned from a specified peer.

(2) Setting the limit on the number of BGP4 + learned routes

Points to note

The example below shows how to limit the number of BGP4+ routes that can be learned from a peer by using the neighbor maximum-prefix command.

Command examples

1. (config)# router bgp 65531

   (config-router)# bgp router-id 192.168.1.100

   (config-router)# neighbor 3ffe:172:16:2::2 remote-as 65532

   (config-router)# neighbor 3ffe:192:168:2::2 remote-as 65531

   Configure the BGP4+ peers.

2. (config-router)# address-family ipv6

   Places the router in config-router-af (ipv6) mode.

3. (config-router-af)# neighbor 3ffe:172:16:2::2 maximum-prefix 1000 80 restart 60

   Allows a maximum of 10000 routes to be learned from the external peer (remote peer address:3ffe:172:16:2::2). Sets a threshold of 80% for output of a warning message, and an interval of 60 minutes before reconnection of any peer that was disconnected because it exceeded the maximum.

4. (config-router-af)# neighbor 3ffe:192:168:2::2 maximum-prefix 100 warning-only

   Allows a maximum of 1000 routes to be learned from the internal peer (remote peer address:3ffe:172:16:2::2), and specifies that any peer exceeding this maximum will not be disconnected.

5. (config-router-af)# neighbor 3ffe:172:16:2::2 activate

   (config-router-af)# neighbor 3ffe:192:168:2::2 activate

   Enables the IPv6 address family.