[c-nsp] Optic Shutdown TX State?

[Tim Durack]

On Fri, Aug 12, 2016 at 10:16 AM, Tim Durack <tdurack at gmail.com> wrote:

> On Thu, Aug 4, 2016 at 2:27 PM, Tim Durack <tdurack at gmail.com> wrote:
>
>> Question: when an optic is "shutdown" on a router, what is the state of
>> the transmitter?
>>
>> (10G DWDM SFP+ optic, EDFA amplified link etc...)
>>
>> --
>> Tim:>
>>
>
> To follow up on my own question: the optics do what the router instructs.
> However, "shutdown" does not guarantee the router is doing what you
> instruct. :-)
>
> OSA measurement confirms this unexpected behavior. I have a case open with
> Cisco to investigate optics turning on/off when router port is in a
> shutdown state. (C6880, SUP2T, 15.2(1)SY1a)
>
> --
> Tim:>
>

Cisco Engineering provided a work-around: "no diagnostic monitor module <n>
test TestUnusedPortLoopback"

Testing indicates this has worked around the problem. Waiting for further
comments from Cisco.

-- 
Tim:>