[c-nsp] Sup-720 fabric failures

Mack McBride mack.mcbride at viawest.com
Fri Jul 5 12:21:56 EDT 2013

This is actually a common fault in electronics (not just routers).
As the device cools, improper solder connections separate causing issues (ie. Something isn't making good contact).
As the device heats up the components expand and restore contact and everything works fine.
This is in fact a fault.  Under normal conditions the device should be able to function as long as you don't get
condensation and you don't freeze the capacitors (which freeze somewhere below 0C).
Obviously fluctuating the temperature will make the situation worse as the poor connection eventually becomes
no connect from shrinking and expanding.

LR Mack McBride
Network Architect

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Phil Mayers
Sent: Friday, July 05, 2013 5:25 AM
To: Robert Williams
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Sup-720 fabric failures

On 05/07/13 12:22, Robert Williams wrote:
> Slightly warmer than that, a cosy 15 degrees Celsius I'm afraid...

That's really weird. We have operated sup720 in places that cool.

> Any ideas?

None spring to mind, beyond a really odd hardware fault.
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