Serial protocol still DOWN when Dialer is UP

Unanswered Question
Oct 5th, 2007

We test ISDN backup by shutdown of Serial IF. ISDN backup comes UP. When we type down no shut on Serial, IF comes UP but protocol is still DOWN. When we manually shutdown Dialer, Serial protocol comes UP. any idea?

I have this problem too.
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smothuku Mon, 10/08/2007 - 20:10

Hi Richard ,

ISdn is backup for serial interface and you haven't mentioned any backup interface command under serial interface.

Please configure "backup interface bri XXX" and "backup delay X X " under serial interface on both the routers.

whenever serial link goes down , Bri comes up automatically.

As soon as serial comes up bri will turn off automatically because of backup interface command under serial IF.




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