thanks....

Let me try that....as it is live link i need to check at off peak hours....let me check..then i will revert to you....any way thanks....for the advice....

I am curious. Why would you want to bring down the protocol on a live link?

depends on what kind of routing protocul ur using u can changes the parameters also there are enough ways to bring down the line protocol. But just as the former poster ask why would u wanted to do that on a live link...

ciao flash

I have an ISDN link as backup for one serial interface...so need to test the backup link is working or not....if I shut down the serial interface ISDN will not fire....Because I have configured backup interface command under serial interface ..so if i shut down the serial interface...the commands also doesnot work out..i have checked that..only my ISDN fires automatically when my line protocol goes down....that only happens when the primary link goes down ...or unplug the serial interface...so in order to check ...i need to physically remove the cables from serial interface..in order to avoid that ...i need a solution that I can sit in my pc and wanted to make line protocol down...and check ISDN...thats all....

could you paste a copy of your config as well the model of router and IOS version?

Could be an IOS bug and you may need to upgrade.

hi,

bradlesliect

I was just replying to ahmednaas previous question....

I understand why he needs to do this. I had a similar issue, and it was IOS related. upgraded the IOS and it solved the problem.

what would be nice is some debug info when you admin shut the link? :)

debug isdn events

debug isdn errors

debug isdn q931

debug isdn q921

Don't do all at the same time though.