[j-nsp] Power issues on 10Gig link

[Mikael Abrahamsson]

On Fri, 24 Jan 2014, Ali Sumsam wrote:

> Hi All,
>
> I am using a SFP-10GBase-ER for my Cisco3750X for a 10gig link going to a
> Juniper MX5-T router (10GE XFP)
>
>
> I am receiving following logs on my Cisco3750X.
>
> %SFF8472-5-THRESHOLD_VIOLATION: Te1/1/2: Rx power low alarm; Operating
> value: -21.3 dBm, Threshold value: -20.0 dBm.
>
> No logs on Juniper.
>
> Does this mean I have to increase the power on the interface?
> Or is there anything else I need to look at?
>
> Following are the readings from my Juniper router.
>
> Laser rx power high alarm threshold       :  1.2589 mW / 1.00 dBm
>    Laser rx power low alarm threshold        :  0.0158 mW / -18.01 dBm
>    Laser rx power high warning threshold     :  1.0000 mW / 0.00 dBm
>    Laser rx power low warning threshold      :  0.0199 mW / -17.01 dBm

Post send and receive power levels from both ends. Also post length of 
fiber, or even better, expected attenuation of fiber.

It might be so simple as a dirty fiber connector somewhere.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se