BFD Timers for router-bgp BFD and static-route BFD Sessions
- On the SLX, you can provide the
Bidirectional Forwarding Detection (BFD) timer configurations per static-route, per
BGP peer and per BGP peer-group.
In SLX versions prior to 20.3.2:
- The timer values provided per static-route, per BGP peer, and per BGP peer-group are not effective for the single-hop static route BFD sessions and single-hop router BGP BFD sessions.
- For the timer values to be effective for the single-hop sessions, you must additionally configure the BFD timers also on the source interface (the interface acting as the BFD source).
But this restriction is removed from 20.3.2 onwards.
- On the SLX, you can provide the BFD timer values directly at the “router bgp”
level.
- In SLX versions prior to 20.3.2:
The timer values provided directly at the “router bgp” level are effective only for the multi-hop BFD sessions of both default and non-default VRF BGP peers.
- In SLX versions 20.3.2 or
above:
The timer values provided directly at the “router bgp” level are effective for both multi-hop and single-hop BFD sessions of both default and non-default VRF BGP peers.
- In SLX versions prior to 20.3.2:
Note
- If EFA gets upgraded first to v2.5.0 and later SLX-OS gets upgraded to v20.3.2 or
above, drift and reconcile operation automatically gets triggered and reconciles
the expected BFD configuration.
Prior to upgrade of SLX-OS, ensure that you enable the maintenance mode on reboot using the efa inventory device setting update --maint-mode-enable-on-reboot Yes –ip <IP address of SLX> command. If you have upgraded SLX-OS without enabling the maintenance mode, trigger a manual drift and reconcile (DRC) using the command efa inventory drift-reconcile execute --ip <IP address of SLX>” –reconcile.
- If SLX-OS is already upgraded to v20.3.2 or above, and then EFA is upgraded to
v2.5.0, trigger a manual drift and reconcile using the command efa inventory drift-reconcile
execute --ip <IP address of SLX>” –reconcile.
If you have not triggered the manual DRC, the efa fabric show --name <fabric name> command shows devices in
cfg-refreshedstate, and the intended BFD configuration does not get configured on the devices. - For the static-route and router-bgp BFD enhancement to be effective, you must upgrade SLX to 20.3.2 or later.