Backup Commands; Extended Keepalive - Avaya G350 Administration

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 and backup pair is active at any given time. An interface is
automatically deactivated when configured as backup.
•
The backup implementation does not protect against the failure of both interfaces. 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 Data Link
Connection Identifier (DLCI) is restored.
NOTE:
The backup interface is not activated when the primary interface is administratively
disabled.

Backup commands

Use the following commands to configure a backup interface:
•
Use the
interface. You must use this command from the context of the interface for which you are setting
a backup interface.
•
Use the
interface, in case of failure. You can also use this command to set a delay before reverting back to
the primary interface. For example, the following command causes the G350 to switch
immediately to the backup interface in the event of primary interface failure, and to delay 60
seconds before reverting back to the primary interface once the primary interface is restored to
service:
G350-???(super-if:FastEthernet 10/2)# backup delay 0 60

Extended Keepalive

The extended keepalive feature is available for WAN Fast Ethernet interfaces. Extended keepalive sends
ping packets through the interface at defined intervals to determine whether the interface is up or down.
This feature provides a quick means to determine whether the interface is up or down. This is especially
important for policy-based routing, in which it is important to determine as quickly as possible whether
the next hop is available. See
Use the
extended-keepalive
feature. Use the
The
extended-keepalive
•
destination ip address
•
next hop MAC address
is only relevant for the WAN Fast Ethernet port.
Administration of the Avaya G350 Media Gateway
June 2004
backup interface command, followed by the interface type and number, to set a backup
command to set the time to wait before switching over to the backup
backup delay
Configuring policy-based routing
command in the context of the interface to enable the extended keepalive
form of this command to deactivate the feature.
no
command includes the following parameters:
— the destination IP address for the keepalive packets.
— the next hop MAC address for the keepalive packets. This parameter
Configuring a WAN
Extended Keepalive
on page 177.
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