Protocol down error on serial port 2610 WAN router

Unanswered Question
Feb 21st, 2007

Hello all,

We recently bonding two t-1 lines for added bandwidth and load balancing for our WAN connection to a satelite campus.

I noticed that on the serial port 0/0 on one the WAN devices (the 2610 at our main campus)is stating that the 'the protocol is down'.

I am attaching the configuration files and any help or advice is greatly appreciated. Also, the serial port s 0/0 on the main campus device is reporting input and frame is the only serial line with errors.



I have this problem too.
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Richard Burts Wed, 02/21/2007 - 13:23


I have looked at the configs that you posted and I do not see an obvious problem.

Line protocol down is a sign that the keepalive mechanism is failing. It is sometimes due to clocking/timing issues, sometimes due to protocol mismatch, and sometimes due to other reasons.

It might be helpful if you would post the output of show interface and show service-module from both routers.




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