Avaya Configuring Dial Services Manual de usuario Pagina 164

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Configuring Dial Services
7-6
308621-14.00 Rev 00
The configuration for this type of network is as follows:
The branch offices are configured for dial backup and are connected directly
to the regional router. They determine whether the connection to the regional
router fails and, if so, invoke the dial backup connection.
The circuits on router 5, the recovery router, are configured as a demand
circuit group, consisting of three circuits. (Router 5 uses an existing demand
pool for the demand circuit group.) These circuits accept calls from the
remote routers configured for dial backup.
The Connection Mode parameter for the circuits in the demand circuit group
is set to No Dial because the recovery router does not initiate connections.
The remote router must establish the connection first.
Router 5’s caller resolution table contains entries for routers 2, 3, and 4. Each
entry specifies the same demand circuit group.
In the example, if one of the branch offices detects a failure of the regional router’s
primary line, it attempts to activate a dial backup connection by placing a call to
the recovery router. The number of branch offices that successfully connect to the
recovery router depends on the number of circuits in the demand circuit group.
After the connection is made, data can continue across the network.
Note: Demand circuit groups work only with PPP. You cannot use them in a
network where the dial backup circuits use frame relay.
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