The failover mechanism provides switchover to backup peers in case of remote peer failure. To enable the failover mechanism, you must:
Configure VPN keepalives, which check the remote peer periodically and announce when the remote peer is dead
Provide backup peers and a mechanism for switching to a backup in case of remote peer failure
In addition to the GRE failover mechanism (see Failover using GRE), the Branch Gateway supports several additional failover mechanisms which are described in the following sections.
