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New Member

ISDN Dial Back-Up works but can't ping

I've set up 2 3640's for dial backup.

When R1 Serial Int goes down, Dialer comes up, Dials via BRI to R2. Connection establishes, Authenticates (CHAP) normally, but I can't ping R2 from R1 or Visa Versa.

Anyone have any ideas?

4 REPLIES
Cisco Employee

Re: ISDN Dial Back-Up works but can't ping

Make sure to use the exact names (case sensitive) in dialer-map statements if you are using it. Anyway, we need to see the configs from both with following debug

debug isdn q931

debug dialer

debug ppp nego

term mon

Here is the link for config and troubleshooting etc

http://www.cisco.com/warp/public/793/access_dial/britobribackup.html

Silver

Re: ISDN Dial Back-Up works but can't ping

are your interfaces on the same subnet ?

New Member

Re: ISDN Dial Back-Up works but can't ping

Hello Jones,

If you still face this problem, why don't you let us see the relevant configurationson both end routers.

Thanks,

Manoj

Silver

Re: ISDN Dial Back-Up works but can't ping

You may also may want to disable fast switching on the bri " no ip route-cache'

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