Failover and stateful failover links

A failover link and stateful failover link are dedicated connections that

  • establish communication between the two units in a failover configuration

  • require the same interface to be used between corresponding devices for consistency, and

  • transmit critical failover and state information between the paired units.

Configuration recommendations

Cisco recommends to use the same interface between two devices in a failover link or a stateful failover link. For example, in a failover link, if you have used eth0 in device 1, use the same interface (eth0) in device 2 as well.