Check your keepalives and your encapsulation.  Also, you might want to give 
debug serial interface a try to see if you can get any clues.

At 09:35 AM 4/16/01, you wrote:
>Hello Everybody.
>
>I am getting very strange problem.
>I have 2 routers in my home lab. One is DTE and one is DCE.
>
>I am getting this message on my one serial interface.
>Status is up. Line Protocol is down. (It was up 2 days ago but now I am
>getting this strange message.)
>
>I checked different clock rate speed on DCE router (64000 and 56000 with
>bandwidth 64K abd 56K) but sill no luck.
>I checked with different Back-to-back cables. I checked status of
>Controllers with Sh sontrollers s 0 command on both routers. It seems that
>cables are ok.
>
>I will appreciate, if somebody can send me the solution or possible
>solutions to solve this problem
>
>
>Thanks
>
>
>Tariq
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>http://www.groupstudy.com/list/cisco.html
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