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Serial Line Speed Limit!!

I have a Cisco2801, two serials configured as a frame-relay switch.

On serial 0/2/0, there's an 805 attached with a back-to-back cable.

On serial 0/2/1 there's a 2612 also with a back-to-back cable.

The 2612 circuit comes up fine.

On the 805 however, I get the SPEED EXCEEDS 512K INTERFACE SHUTDOWN message.

I wonder how I can make the 2801 serial interface behave as a 512K....

Weird thing is I'm able to get an HDLC link with no complains from the 805, but not a frame-relay one.

Any comments will be appreciated.

Thank you.

Charles.

2 REPLIES
Hall of Fame Super Silver

Re: Serial Line Speed Limit!!

Charles

I am not sure at this point why you have the problem when configuring the interface as Frame Relay and not a problem when configuring the interface as HDLC. Perhaps if you post the router configs we might notice something that would lead us to an answer.

HTH

Rick

Green

Re: Serial Line Speed Limit!!

Check to see that the 2801 has the DCE-end of the back-to-back cable, that the interface is set for DCE (show controller, ~top three lines, intf-type DCE), and that the clock-rate is set for the correct value.

Perhaps you have the cable reversed, and the 2600 is actually setting the clock rate (back to back cable have a DCE end and a DTE end).

Good Luck

Scott

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