
Dial Backup Implementation Notes
114062 Rev. A 5-5
When the router activates a line in the demand pool, the circuits in a demand
circuit group also become available. The router does not actually bring up the
circuits until it receives an incoming call. Demand circuit groups can only receive
calls.
A circuit group can belong to more than one demand pool. This enables the router
to use one configuration for circuits across the router’s slots. Note however, that
demand pools cannot cross slots.
Each demand circuit group has its own ID. This number is distinct from the
demand pool ID that identifies the line pool.
Note that both individual demand circuits and demand circuit groups can use the
same demand pool.
Caller Resolution for Demand Circuit Groups
Similar to individual demand circuits, demand circuit groups use either PAP or
CHAP to identify who is calling the router and to determine which circuit group
to activate. You can enable either of these authentication protocols on only one
side of the link (one-way authentication), or on both sides of the link (two-way
authentication). For information about authentication, refer to Chapter 3.
Depending on a network’s security requirements, each remote node can have a
unique CHAP Name or PAP ID, or the remote nodes can use the same name. For
each remote caller with a unique PAP ID or CHAP Name, the caller resolution
table contains a demand circuit group ID. The remote callers may use the same
demand circuit group ID. When it authenticates an incoming call, the recovery
router receives the ID or name, and then looks up the corresponding circuit group
ID in the table. From this circuit group, the router selects an available circuit and
establishes the unnumbered protocol configuration over that circuit.
To simplify configuration, the caller resolution table may contain the same PAP
ID or CHAP name for all remote nodes in the network. Then the table has only
one entry consisting of the name and the demand circuit group ID.
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