Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 110)

100

101

Configuring Dial Services

3-20

308621-14.00 Rev 00

mode

can be:

initiator - Instructs the router to initiate dialing. The router at the other end must

be set to

receiver so that it waits until the initiator router makes the call. Only a

router on one side of the link can serve as the initiator. If both are set to

initiator,

they may try to initiate a call simultaneously, resulting in a collision on the

network.

receiver - Instructs the router to wait to receive the call from the initiator.

If you

configure the router to be the receiver, you must create a caller resolution entry for

the circuit that identifies the remote initiator router. The local router can then

verify the initiator’s identity and accept the incoming calls.

For example, the following command creates a backup circuit that uses the lines in

pool 8, designates the leased PPP interface 2/1 as a primary interface, and sets the

backup mode to

initiator.

ppp/2/1# backup-circuit pool-id 8 backup-mode initiator

Go to “Specifying the Authentication Protocol Information” on page 3-20.

Protocols for Backup Circuits

For dial backup lines, the dial command also configures the default data link

protocol, PPP. Using the BCC, PPP is the only protocol you can configure for the

backup circuit.

Specifying the Authentication Protocol Information

For network security, the router that initiates a call must identify itself to the

remote router. The authentication protocols, CHAP and PAP, enable the

identification process. CHAP is the default protocol. All lines in a pool must use

the same authentication protocol.

The

CHAP name

is part of the outbound call; it informs remote peer routers of the

local router’s identity.

The

CHAP secret

is for identification and security purposes, and must be the same

on both sides of the link.

When one router places a call to another router, an

authentication process takes place. During this phase, the routers send challenge

packets back and forth that include the CHAP secret. Both routers on a link must

have the same CHAP secret to correctly calculate responses to the challenges.

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