E3 Controller Flaps continuously.

mpsameer · ‎09-15-2006

Hi All,

At one of my customer we have Cisco 3700 series router with E3 card installed. Customer is having a 15Mb FR link via this E3. We have found from the router log, E3 card flaps continuously. The clock spurce on CE side is Line where as on PE side its Internal. The router log -

Sep 14 12:28:47.969 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to down

Sep 14 12:28:48.969 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to up

Sep 14 12:44:58.943 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to down

Sep 14 12:44:59.943 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to up

Sep 14 18:48:39.209 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to down

Sep 14 18:48:40.209 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to up

Sep 14 19:34:30.123 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to down

Sep 14 19:34:31.123 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to up

Sep 15 00:30:56.518 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to down

Sep 15 00:30:57.518 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to up

Sep 15 01:39:01.374 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to down

Sep 15 01:39:02.374 GMT: %CONTROLLER-5-UPDOWN: Controller E3 1/0, changed state to up

The problem is intermittent.

Can any one diagnose this and let us know the findings.

Thanks and Regards

Same

gauravprakash · ‎09-15-2006

Fist check that bandwidth set on both ends are same..shud be normally the same..

Which controlers/cards do u have on bothe ends ?

You might need to have on CE side..

Regards,

Gaurav

jsg0901 · ‎09-15-2006

This looks like the link is physically going up & down. This is likely a problem with the E3 frame relay circuit itself (most likely the local loop) rather than the router itself.

If the problem is intermittant, Make sure the router clock is sync'd via NTP so that you have very accurate time readings and then ticket with your carrier. When ticketing note that you have some exact times in yours logs where your seeing the up down that you can give them. (they may be able to correlate this to some of their internal logs) In my experience, these intermittant problems with the carriers can sometimes be a pain to resolve so you may need to call constantly to complain about the problem before they resolve it. (most likely by moving you to another port on their frame Relay switch)

Also do a 'show controller E3' and 'show interface' to see if your getting constantly incrementing input errors - which you also need to ticket with the carrier to fix (but is a lot easier get resolved).

cheers!