Cisco: Low Optical Transmit Power

[mchinjaws]

Does this point to an issue with an SFP?

We have a 4500-x vss stack, through which runs the heartbeat for a bunch of vrrp groups upstream, both routers have been going active due to loss of heartbeat.

One of the switch uplinks has a tx power of -10db on the switch, but router upstream is showing healthy rx signal of -5db.

[Flavio Miranda]

Hi

 I dont think so.  But, you can configure an IP address on those interface and ping to make sure there is connectivity and no pacekt loss. 

[sgpn16]

We have the same setup at our company and had the same problem at our company. 

Steps:

1) Check and clean fiber ends. 

2) Try switching fiber cables or transceivers. 

3) Check fiber patch panels.

[Leo Laohoo]

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@mchinjaws wrote:

One of the switch uplinks has a tx power of -10db on the switch, but router upstream is showing healthy rx signal of -5db.

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Depends on the optics.  If the optics are DOM-capable, it should show up in the logs if either one is reporting low power.  

[sgpn16]

Please provide output as shown above from our core switch.