
Configuring Dial Services
3-16
117353-B Rev. 00
For example, the following command creates a backup circuit that uses the lines in
pool 8, it designates the leased PPP interface 2/1 as a primary interface, and it sets
the backup mode to initiator.
ppp/2/1# backup-circuit pool-id 8 backup-mode initiator
Specify 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 and 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.
To configure the local router’s CHAP parameters, navigate to the backup-circuit
prompt and specify a CHAP name and secret as follows:
chap-name
<
text-string
>
chap-secret
<
text-string
>
text-string can be any text string; maximum of 20 characters.
For example:
backup-circuit/8/1/1# chap-name bayrs1 chap-secret east
Do one of the following:
• If you have ISDN lines in the pool, go to C
reating an Outgoing Phone List on
page 3-17
.
• If you have only Raise DTR lines in the pool, go to Setting Up the Caller
Resolution Table on page 3-19.
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