This document explains that IPSec Stateful Failover (VPN High Availability) is a feature that enables a router to continue processing and forwarding packets after a planned or unplanned outage. You can employ a backup (standby) router that automatically takes over the primary (active) router's tasks in the event of an active router failure. The process is transparent to users and to remote IPSec peers. The time that it takes for the standby router to take over depends on HSRP timers. ec Stateful Failover (VPN High Availability) is designed to work in conjunction with Reverse Route Injection (RRI) and Hot Standby Router Protocol (HSRP) with IPSec. When used together, RRI and HSRP provide a more reliable network design for VPNs and reduce configuration complexity on remote peers.
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