Configuring BFD on LAG links

Prerequisites

BFD can be configured under the LAG context to create and establish the micro-BFD session per link after the LAG and associated links have been configured. An IP interface must be associated with the LAG or a VLAN within the LAG, if dot1q encapsulation is used, before the micro-BFD sessions can be established.

Complete the following steps to enable and configure BFD over the individual LAG links:

When configuring the local and remote IP address for the BFD over LAG link sessions, the local-ip parameter should always match an IP address associated with the IP interface to which this LAG is bound.  In addition, the remote-ip parameter should match an IP address on the remote system and should also be in the same subnet as the local-ip address.  If the LAG bundle is re-associated with a different IP interface, the local-ip and remote-ip parameters should be modified to match the new IP subnet. The local-ip and remote-ip values do not have to match a configured interface in the case of tagged LAG/ports.

The optional parameters that can be configured for the BFD over LAG links include:

The following is an example configuration:

*A:Dut-C>config>lag# info 
----------------------------------------------
        bfd
            family ipv4
                local-ip-address 10.120.1.2
                receive-interval 1000
                remote-ip-address 10.120.1.1
                transmit-interval 1000
                no shutdown
            exit
        exit
        no shutdown

Procedure

  1. Enable BFD within the LAG context, which also enters the CLI into the BFD context
  2. Configure the address family which is to be used for the micro BFD sessions. Only one address family can be configured per LAG
  3. Configured the local-IP address to be used for the BFD sessions
  4. Configure the remote-IP address to be used for the BFD sessions