Configuring a Backup Interface for a Subinterface
You can use a backup interface with both a point-to-point and a multipoint Frame Relay subinterface. This allows individual PVCs to be backed up in case of a failure rather than waiting for the entire Frame Relay connection to fail before any redundancy takes over. You can configure a subinterface for backup on a failure only, not for backup based on the loading on the subinterface.
Any backup interface that you configure for the main interface has precedence over any subinterface backup interface that you have configured when a complete loss of connectivity is experienced. Because of this, a subinterface backup is activated only if the main interface is up or if the main interface is down and ...
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