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Implementation Notes

3-9

The identiﬁcation process takes place during PPP link negotiation, which occurs

before the routers establish a connection to send data. It enables the destination

router to identify the caller dynamically, allowing a single dial interface (ISDN or

modem) at a remote router to serve as the connection point to multiple routers. To

enable caller identiﬁcation, you must ﬁll in the router’s caller resolution table.

When you conﬁgure dial services, Site Manager automatically creates a special

PPP line record that all line pools use. This is a generic record that a circuit uses

for identiﬁcation.

CHAP is the default authentication protocol. To select PAP, you must go to the

PPP Interface List window, select the special line record for dial services, and

specify PAP in the Local Authentication Protocol parameter. Note that all lines in

a pool must use the same authentication protocol. You cannot have one line using

CHAP while another uses PAP.

For more information about PPP and conﬁguring authentication protocols, see

Conﬁguring PPP Services.

CHAP Names and PAP IDs for Caller Resolution

PPP uses one of two authentication protocols to identify a peer router — CHAP or

PAP. Speciﬁcally, you must conﬁgure the routers at each end of the connection to

use either a CHAP name and secret or PAP ID and password. Before establishing

a connection, the routers at each end of the connection must agree on the CHAP

name and secret or PAP ID and password so PPP can determine who is calling the

router and which circuit to bring up.

How the Router Uses CHAP Names and PAP IDs

Figure 3-4 illustrates how CHAP works. PAP works in a similar way. Routers A

and B have a caller resolution table that maps circuit numbers to names. The

routers use their resolution tables to identify the caller and to bring up a circuit.

For example, you conﬁgure Router A’s table to specify that Branch_B is the

CHAP name for all links between it and Router B. Router B’s table indicates

Branch B is associated with Circuit 5, which connects to Router A. When Router

A calls Router B, it places the CHAP name, Branch B, and secret in the call setup.

Router B looks in its table, conﬁrms the name and secret, and brings up Circuit 5.

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Avaya Configuring Dial Services Manual de usuario Pagina 59