Have you ever cleared counters on a serial interface and killed your WAN connection?

[misscat123]

I have router running 12.4(24)T2, RELEASE SOFTWARE (fc2) and I have had devastating results issuing a 'clear counters s0/0/0' command.

This knocked out my MPLS connection! What am I doing wrong? It has happened to me twice now at 2 different remote locations. Not good for the career. Anybody have the same issue ever? Thanks[

[gerald.suiza]

do you have any logs on the router we can look at before and after you did a clear counter?

[Latchum Naidu]

Hi,

Please use "clear counters" in privilige mode only. This will clear counters on all interfaces.

I used to do this many times without any disconnects.

Please click on the correct answere if this answered your question.
Regards,
Naidu.

[Latchum Naidu]

Hi,

Please use "clear counters" in global config mode. This will clear counters on all interfaces.
I used to do this many times without any disconnects and this is recommended as per best practice.

Please click on the correct answere if this answered your question.
Regards,
Naidu.

[misscat123]

The issue may lie in the configuration of the serial interface:

interface Serial0/0/0 
description TO AT&T MPLS ID:  
ip address 172.16.2.25 255.255.255.252 
ip flow egress 
encapsulation ppp 
service-module t1 clock source internal 
service-module t1 timeslots 1-24 
service-policy output VOIP

Someone was saying that the clock should be line on a serial interface.

I am going to the site this weekend so will issue command from console and check results.

also plan on opening a tac case for this.

version is 12.4(24)T2, RELEASE SOFTWARE (fc2)

[vmiller]

Just about any time you get serial carrier services, you should take clock source from the line - not internal.

watch some of your low level counters (frame crc0 disappear after you change