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Command Reference Guide Frame Relay Sub-Interface Config Command Set
61200510L1-35E Copyright © 2005 ADTRAN 878
!
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 example configures the AOS to answer dial-backup calls on this endpoint but never generate
calls:
(config)#interface frame-relay 1.16
(config-fr 1.16)#dial-backup call-mode answer-always
Technology Review
This technology review provides information regarding 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 outbound calls, the AOS matches 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-interface.
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.