ISDN backup problems

[kokencisco]

Hi,

I configured a ISDN backup line with dialer-watch between a CISCO 7200 and Cisco 1721 but the connection is UP only for 20 seconds then it is DOWN.

Can you help me?

[Georg Pauwen]

Hello,

check if you have a dialer idle-timeout set to 20 seconds, or a dialer fast-idle, if so, you might want to increase those values (keep in mind that

Dialer Watch checks for the primary route at the interval configured with the dialer idle-timeout).

Otherwise, can you post your configurations (both sides) ?

Regards,

GP

[kokencisco]

On the 1721 the configuration is:

interface Dialer1

ip address xxx.xxx.xxx.xxx 255.255.255.252

encapsulation ppp

no ip split-horizon

dialer pool 1

dialer remote-name 7200-1

dialer idle-timeout 3

dialer string 00000000

dialer watch-disable 10

dialer watch-group 1

no cdp enable

ppp authentication chap callin

!

On the 7200 the configuration is:

interface Dialer1

description Backup from 1721

ip address xxx.xxx.xxx.xxx 255.255.255.252

dialer pool 1

dialer remote-name 1721

dialer idle-timeout 86400

!

If you have to know more, ask me.

thank you

[stephenshaw]

Hi, we've run into a very similar problem (several times) that turned out to be the Service provider provisioning, somewhere within their ISDN, a "voice" service instead of "data."

I suggest running a "debug isdn q921 and debug isdn q931" capture this info (the reason for the disconnect is always in the output - look it up and send it to your Service provider).

Good luck,

Steve

[Georg Pauwen]

Hello,

stupid question maybe, but I assume you have your dialer-group and dialer-list configured ?

Regards,

GP

[kokencisco]

No problem,

Yes dialer group and dialer list are configurated!