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Command Reference Guide
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 AOS accesses specific routing information, etc.):
Dialing Out
1. AOS determines to place an outbound call when either the Layer 1 or Layer 2 has a failure.
2. When placing outbound calls, AOS matches the number dialed to a PPP interface. This is accomplished
with an addition to the dial-backup number command (refer to
2326).
3. When placing the call, AOS uses the configuration of the related PPP interface for authentication and IP
negotiation.
4. If the call fails to connect on the first number dialed, AOS places a call to the second number (if a
second number is configured). The second number to be dialed references a separate PPP interface.
Dialing In
1. AOS receives an inbound call on a physical interface.
2. Caller ID is used to match the dial-backup number command to the configured PPP interface.
3. If a match is found, the call connects and 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.
60000CRG0-35E
Copyright © 2012 ADTRAN, Inc.
HDLC Interface Command Set
dial-backup number <number> on page
2322
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