Backup Commands; Modem Dial Backup - Avaya G250 Administration

Only one member of a primary and backup pair is active at any given time. An interface is
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automatically deactivated when configured as backup.
The backup implementation does not protect against the failure of both interfaces.
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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
Note:
administratively disabled.

Backup commands

Use the following commands to configure a backup interface:
Use the backup interface command, followed by the interface type and number, to set
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a backup interface. You must use this command from the context of the interface for which
you are setting a backup interface.
Use the backup delay command to set the time to wait before switching over to the
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backup 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
G250/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:
G350-001(super-if:FastEthernet 10/2)# backup delay 0 60

Modem dial backup

This section describes the modem dial backup feature and includes the following topics:
Modem dial backup overview
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Typical installations
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Configuring modem dial backup
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Modem dial backup interactions with other features
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Configuration example
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Modem dial backup maintenance
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Modem dial backup
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