Configuring BGP additional-paths and additional-path selection at address-family level

1. From privileged EXEC mode, enter global configuration mode.
   

   device# configure terminal
   

2. Enable BGP routing.
   

   device(config)# router bgp
   

3. Enter configuration mode for the IPv4 unicast address family.
   

   device(config-bgp)# address-family ipv4 unicast
   

4. Enable receiving and sending of additional paths.
   

   device(config-bgp-ipv4u)# additional-paths receive send
   

   A device can be configured to receive, send, or receive and send additional paths.

   

   Note

   A change to the additional-paths capability is activated only after restarting the BGP session.
5. Specify paths that are candidates for selection as additional-paths. The following example specifies that all paths are candidates for selection as additional-paths.
   

   device(config-bgp-ipv4u)# additional-paths select all
   

   The all option configures all (up to a maximum of 16) paths as candidates for selection as additional-paths.

The following example enables the receiving and sending of BGP additional-paths and specifies that all BGP paths are eligible for selection as additional-paths under the IPv4 unicast address family.

device# configure terminal
device(config)# router bgp
device(config-bgp)# address-family ipv4 unicast
device(config-bgp-ipv4u)# additional-paths receive send
device(config-bgp-ipv4u)# additional-paths select all