13.5.3 BGP4 multipath configuration

(1) List of configuration commands

The following tables list the commands used to configure BGP4 multipathing.

Table 13-17: List of configuration commands

Command name	Description
bgp always-compare-med	Enables comparison of the MED attribute of routes learned from different ASs. (If this command has not been set, you cannot set the all-as parameter in the maximum-paths command.)
maximum-paths	Sets the maximum number of paths to a given destination.

(2) Configuring BGP4 Multipathing

Points to note

To specify the all-as parameter in the maximum-paths command, you must first set the bgp always-compare-med command.

Command examples

1. (config)# router bgp 65531

   (config-router)# bgp router-id 192.168.1.100

   (config-router)# neighbor 172.16.2.2 remote-as 65532

   (config-router)# neighbor 172.17.2.2 remote-as 65533

   Configures the peers that will participate in multipath routing. In this example, the routes learned from AS65532 and AS65533 will be alternative paths in a multipath route.

2. (config-router)# bgp always-compare-med

   (config-router)# maximum-paths 4 all-as

   (config-router)# exit

   Specifies that a maximum of four paths, including paths learned from different ASs, can be in a multipath.