About setting the rapid switchover stale timer

After a failover has occurred, use the rapid switchover stale timer to set the amount of time that you want route and neighbor table entries to be re-added to the FIB on the active management module.

Layer 3 applications and protocols rely on existing routing information in the FIB. They restart and operate as if the switch performed a quick reset.

When a failover occurs, the interface modules and the fabric modules continue forwarding Layer 3 traffic based on the information in the FIB. The transitioning standby management module marks all routes in the FIB as "stale". The routing protocols restart, reestablish their neighbors and reconverge. As a route is added in again, the route's stale designation is removed. After the rapid switchover stale timer expires, the remaining stale route entries are removed. Multicast flows are also removed; the multicast application re-adds the flows after failover completes.