Avaya Configuring Dial Services Instrukcja Użytkownika Strona 93

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Dial Services Overview
114062 Rev. B 2-19
Configuration of the Backup Circuit
The configuration of the backup circuit depends on the protocol for that circuit. If
Standard or PPP is running over the primary circuit, the backup circuit inherits the
primary’s network layer address configuration. Unlike the network layer address
configuration, the data link layer configuration can be unique.
If Frame Relay is running over the primary circuit, the backup circuit can inherit
the primary’s configuration or it can use its own configuration. When the Frame
Relay primary and backup circuit use the same configuration, it is called the
shared configuration. The shared configuration allows a backup circuit to use the
same network layer address as the primary circuit. The backup circuit’s data link
layer configuration (PVCs, DLCIs, and filters) can be the same or different from
the primary circuit.
If the backup circuit uses a unique configuration, it is called the secondary
configuration. A secondary configuration uses a different network layer address,
and data link layer configuration (PVCs and filters) from the primary circuit.
Activating the Backup Line
When the router detects a failure on the primary line, it selects a line from a
backup pool. The router activates a backup line when
The primary circuit is not operating.
All of the primary circuit’s lines have failed.
An active backup line has failed.
If the backup line itself fails, an inactive backup line can replace it only if you
configure multiple lines in the backup pool. If the first line fails for every
phone number in the router’s phone list, and the primary line is still down, the
router tries the next line in the pool.
If you are backing up a Frame Relay primary circuit, the router (not the
network) activates and terminates the Frame Relay backup connection. The
router rejects incoming calls from the Frame Relay network.
Note: If the backup circuit connects to a different interface at the destination
than the primary circuit, you do not need to configure unique PVCs for the
backup circuit. In this case, the switch informs the destination router of the
available PVCs.
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