[c-nsp] Sup-720 fabric failures

[Michael Loftis]

Just very recently had this happen with a Brocade ADX SSL Accelerator
upgrade board.  On first boot it would crash the ADX a few times until
everything warmed up, and then appeared to be more or less ok.  If we
shutdown the nodes in the cabinet with it, it would cool off too much and
never come up, or crash after being up for a while.

It's a problem that's alive and well.


On Fri, Jul 5, 2013 at 9:54 AM, Chuck Church <chuckchurch at gmail.com> wrote:

> Anyone remember the term 'chip creep'?  Came across that back in a Novell
> Service and Support exam a LONG time ago.  Still relevant!
>
> Chuck
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Mack
> McBride
> Sent: Friday, July 05, 2013 12:22 PM
> To: Phil Mayers; Robert Williams
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Sup-720 fabric failures
>
> 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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