[c-nsp] Strange X2 Temperature Flaps

[Drew Weaver]

He's right, this happens and some 3rd party optic vendors still sell X2s like this so we just buy all Cisco now at least for X2s they aren't that expensive.

Thanks,
-Drew


-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Saku Ytti
Sent: Thursday, March 17, 2016 12:20 PM
To: Robert Williams <Robert at custodiandc.com>
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Strange X2 Temperature Flaps

On 17 March 2016 at 17:37, Robert Williams <Robert at custodiandc.com> wrote:
> Each time it completes a loop it jumps from -127 to +127 - at _that_ moment we get a short burst of CRC errors in the ASR9k which is connected to the other end of the link. In two of the cases so far, the errors were enough to trip OAM on the ASR9k into err-disable on the port due to >3 seconds of symbol errors.

This is buggy microcontroller from gigalight where after 2**31 1/100th of a second you start to write clock in temperature sensor memory-area.


Fun times when you have tons of these, and in maintenance window boot lot of devices, then after 2**31 has passed, they all go down at the same time. Reminder that no amount of redundancy really guarantees you anything.

For what it is worth, gigalight handled this issue extremely well for us, even though we didn't do any business with them. But the broker who sold them to us, 'network wide' was my worst experience ever.

--
  ++ytti
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