Configuring BFD Over LAG links

After the LAG and associated links are configured, you can configure BFD in the LAG context to create and establish the micro-BFD session per link. Before micro-BFD can be established, an IP interface must be associated with the LAG or a VLAN within the LAG, if dot1q encapsulation is used.

Perform the following to enable and configure BFD over individual LAG links.

Within the lag context, enter the bfd context and enable BFD.
Configure the address family for the micro-BFD sessions. Only one address family per LAG can be configured. On the 7210 SAS-T, 7210 SAS-R6, and 7210 SAS-R12, only the IPv4 address family can be configured.
Configure the local IP address for the BFD sessions.
Configure the remote IP address for the BFD sessions.

When configuring the local and remote IP address for the BFD over LAG link sessions, ensure that the local-ip parameter should always match an IP address associated with the IP interface to which the LAG is bound. In addition, the remote-ip parameter must 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 reassociated with a different IP interface, modify the local-ip and remote-ip parameters 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 or ports.

The following optional parameters can be configured for BFD over LAG links:

transmit interval
receive interval
multiplier
max-wait-for-up-time — This parameter controls how long a link will remain active if BFD is enabled after the LAG and associated links are active and in a forwarding state.
max-time-admin-down — This parameter controls how long the system will wait before bringing the associated link out of service if an admin down message is received from the far end.

Example

The following is a sample configuration output.

*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