ADTRAN 1000R Series

Command Reference Guide Frame Relay Sub-Interface Config Command Set

interface fr 1.100 point-to-point

frame-relay interface-dlci 100

ip address 10.1.1 .1 255.255.255.252

dial-backup call-mode answer

dial-backup number 555-8888 analog

line telnet 0 4

password adtran

Usage Examples

The following exampl e configures the AOS to answer dia l-backup calls on this end point but never genera te

calls:

(config)#interface frame-relay 1.16

(config-fr 1.16)#dial-backup call-mode answer-always

Technology Review

This technology review provides information regardin g specific dial-backup router behavior (i.e., when the

router will perform dial-backup, where in the configuration the AOS accesses specific routing information,

etc.):

Dialing Out

1. The AOS determines to place an outbound call when either the Layer 1 or Layer 2 has a failure.

2. When placing o utbound calls, the AOS match es the number dialed to a Frame Relay sub-interface. This

is accomplished with an addition to the dial-backup number command (refer to dial-backup number

<digits> [analog | digital-56k | digital 64k] <isdn min chan> <isdn max chan> <interface> on page

882).

3. When placing the call, the AOS uses the configuration of the related Frame Relay sub-interface for

authentication and IP negotiation.

4. If the call fails to connect on the first number dialed, the AOS places a call to the second number if

configured. The second number to be dialed references a separate Frame Relay sub-inter face.

Dialing In

1. The AOS receives an inbound call on a physical interface.

2. Caller ID is used to match the dial-backup number command to the configured Frame Relay

sub-interface.

3. If a match is found, the call connects and the AOS pulls down the primary connection if it is not already

in a down state.

4. If no match is found from Caller ID, the call is terminated.