Connectivity Guide
BFD for Static route
The static Route BFD feature enables association of static routes with a BFD session in order to monitor the static route reachability.
Depending on the status of the BFD session the static routes are added to or removed from the Routing Information Base (RIB). When
BFD is congured, the nexthop reachability is dependent on the BFD state of the BFD session corresponding to the specied next hop. If
the BFD session of the congured nexthop is down the static route will not be installed in the RIB.
The BFD session needs to be established successfully for the static route. BFD must be congured on both the peers pointing to its
neighbor as next hop. There is no dependency on the order of conguration of static route and BFD conguration. The user has provision
to congure BFD for all the static routes congured or for none of the static routes. Both IPv4 and IPv6 static route BFD is supported.
NOTE: You can congure BFD for all the static routes. Meaning, there is no provision for conguring BFD only for some of the
existing static routes.
Conguring BFD for static routes is a three-step process:
1 Enable BFD Globally.
2 Congure static routes on both routers on the system (either local or remote). Congure static route in such a way that the next-hop
interfaces point to each other.
3 Congure BFD for static route using the ip route bfd command
Establishing BFD Sessions for IPv4 Static Routes
Sessions are established for all neighbors that are the next hop of a static route.
To establish a BFD session, use the following command.
Establish BFD sessions for all neighbors that are the next hop of a static route.
ip route bfd [interval interval min_rx min_rx multiplier value role {active | passive}]
CONFIGURATION Mode
Establishing BFD Sessions for IPv4 Static Routes in a non-default VRF
instance
To establish a BFD session for IPv4 static routes in a non-default VRF instance, use the following command.
Establish BFD sessions for all neighbors that are the next hop of a static route.
ip route bfd [vrf vrf-name] [interval interval min_rx min_rx multiplier value role {active |
passive}]
CONFIGURATION Mode
Changing IPv4 Static Route Session Parameters
BFD sessions are congured with default intervals and a default role.
The parameters you can congure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role. These
parameters are congured for all static routes. If you change a parameter, the change aects all sessions for static routes. To change
parameters for static route sessions, use the following command.
Change parameters for all static route sessions.
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