
Implementation Notes
3-21
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. (Refer to the section “Point-to-Point Protocol” on page 3-8 for
information about CHAP and PAP.)
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.
A router configured with demand circuit groups does not initiate connections for
the group; the remote side of the connection must place the call first.
Consequently, you do not need to configure the local PAP ID and password or
CHAP name and secret for a call request.
If, for added network security, each remote node has a unique PAP ID or CHAP
name and the same circuit group ID, the router verifies the caller’s name in the
incoming call setup message. If it does not match a name in the table, the router
disconnects the call.
Note: The caller resolution table may not contain both individual demand
circuit numbers and demand circuit group IDs for the same caller name.
Comentarios a estos manuales