STP Issue

[Jothiprakash.S5886]

often we are receiving the STP change logs from the L2 switch and we could see flap in uplinks. We are getting log below.

    %SFF8472-3-THRESHOLD_VIOLATION: Gi1/1/1: Rx power low warning; Operating value: -18.2 dBm, Threshold value: -16.9 dBm.

    %SFF8472-3-THRESHOLD_VIOLATION: Gi3/1/1: Rx power low warning; Operating value: -17.3 dBm, Threshold value: -16.9 dBm.

[Mark Elsen]

 - Probably software bug, ignore if no effective connectivity problems are seen

 M.

[ICANG · Accepted solution]

Hi,

First of all can you please check what kind of fibre cable and sfp module do you use ? Something like single mode or multimode.? If wrong can you please fix and check again?

Apart from that error message could be due to one of the following;

Bad fiber or  Bad transceiver module

As an another action plan;

1-) You can replace the fiber link all over the path .

2-) You can try to replace the transceiver module on both side . 

Thank you

Best Regards

PS: Please don't forget to rate if it's helpful

[Jothiprakash.S5886]

Hi ,

   Awaiting for the customer reply.

[balaji.bandi]

If this was working for long you see suddenly? 

in that switch only 2 ports having issue rest all ok.

i would inspect physical patch cable and replace SFP and test again and monitor