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Backup Interfaces
Avaya X330WAN User’s Guide 45
Note: A Frame Relay interface in a Backup/Primary role overrides the role of its
Sub-interfaces.
Configurable activation/deactivation delays provide a damping effect on the
Backup interface pair. This eliminates Primary-Backup switching in case of
fluctuating underlying Layer 2 interfaces. You can configure the following Backup
delays:
• Failure delay - The time in seconds between the Primary interface going down
and the Backup interface activation. Default = 0 seconds, maximum = 3600
seconds.
• Secondary Disable delay - The time in seconds between the Primary interface
restoration and the Backup interface deactivation. Default = 0 seconds,
maximum = 3600 seconds. Both interfaces are active during this time to enable a
smooth transition for the routing protocols.
Note: You can also configure the X330WAN not to revert back to the Primary
interface after it is restored.
The following rules govern the interface Backup relations:
• Each interface can have only one Backup interface.
• A Backup interface can serve as a backup for only one other interface.
• Only one member of a Primary-Backup pair is active at any given time. An
interface is automatically deactivated when set as Backup.
• The Backup implementation does not protect against a double fault. Therefore,
if a Backup interface fails while active, no switch to the Primary interface is
attempted.
When using Frame Relay encapsulation, the Frame Relay interface is considered
down when its primary DLCI is down. The switch over back to the main interface
occurs when the primary DLCI is restored.
Note: The Backup interface is not activated when the Primary interface is
Administratively disabled.