after upgrade from 12.0.7T to 12.1.16 on 3640, i have problem on dialer backup. If i shutdown the bri with the dialer active, or in call state, there is no mode to create a feature backup connection. I have tried to recreate another dialer, destroy the pool association with the bri without any good result. Only reloading the router can permit to have a new "debug isdn q931" output.
Please note the ISDN is a point-to-point BRI NT1 and the interface has the static-tei 0.
Not exactly sure what you are trying to do..But i think you are trying to configure a backup for ISDN bri line..using dialer interfaces..right?
You can't configure a backup for a DDR capable line like ISDN using "backup interface xxx" command. You need to use a floating statis routes or dialer watch function for that. Here is the link which explains all three methods for backup.
For DDR link there has to be the interresting traffic flowing to trigger the call. So when you issue "shut/no shut" for bri and dialer interface, you need to generate the interesting traffic like ping etc..
Now after you issue "shut/no shut" on bri interface issue
sh isdn status
and verify that layer 2 status is "Multiple frame established"
If it is, enable following debug after you issue "shut/no shut"
debug isdn q931
debug ppp nego
After that generate a ping for interesting traffic and see what is the debug you see.
Yes, i have interesting traffic, like ping, telnet and soon.
After shut/noshut, the ISDN L2 is correctly setted to "MULTIFRAME_ESTABLISHED", and with "debug isdn q921" i can see my bri interface talking with NT1, and viceversa.
NO any other "debug dialer", "debug isdn q931", "debug ppp negotiation" after the last noshut command. I have tried for two hours without result and the access-list of dialer-list mark interesting packet but the dialer was always down.
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