[c-nsp] Cisco 2960G Issue

[Paul Cosgrove]

Hi Mike,

As I understand it that is the way the ASICs are shared on most of the
catalysts.  Lightning striking an ethernet cable can affect connectivity
in a similar, though more persistent way;  switch survived but four
adjacent ports were permanently disabled.  Have you recently found any
unexpected gaping holes in the roof? :)

Paul.

Matlock, Kenneth L wrote:
> Sorta sounds ike a bad chip on the chassis, since it's affecting 4 adjacent ports.
>  
> 1-4 probably share an Asic (or part of one), 5-8, 9-12, etc.
>  
> I'd call TAC on this one to get a replacement.
>  
> Ken
> 
> ________________________________
> 
> From: cisco-nsp-bounces at puck.nether.net on behalf of Mike Cooper
> Sent: Wed 8/27/2008 3:39 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Cisco 2960G Issue
> 
> 
> 
> Hi all,
> 
> I've got a WS-C2960G-24TC-L switch running IOS 12.2(35)SE5
> 
> It's been in production for a couple of weeks in a fairly straight
> forward L2 environment.
> 
> We noticed this afternoon a few hosts connected to the switch suffering
> persistent packet loss of ~20%
> 
> After a bit of investigation we narrowed it down to ports 5, 6, 7, 8.
> The ports were configured as access ports, 1 @ 10M/FD 3 @ 1G/FD, all
> were in different vlans. My assumption is the switch runs six ASICs, and
> that the one that operates those 4 ports has faulted or degraded in some
> way causing the performance issues.
> 
> None of the other machines connected to the switch were affected, and
> currently the switch is still operating.
> 
> I've since relocated the affected machines to an alternate switch,
> resolving the loss issues.
> 
> I'm interested if anyone is aware of this as a common problem with 2960G
> switches (or any switches for that matter), and if there are any tips
> for testing/troubleshooting before I return it as faulty. I bought 4
> brand new 2960Gs in one go, 1 was DoA, and now this one has developed
> faults which is leaving me with some concerns for the others.
> 
> Cheers,
> 
> --Mike
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