[c-nsp] Weird problem on Cat6509 + WS-X6348-RJ-45

[Tim Stevenson]

Well, from the 6500 side, there is a lot more to look at than just 
the ARP cache.

There are many platform specific commands that should be issued from 
the 6500 side when the problem is happening. TAC should know what 
these commands are (if they don't, then escalate the case, you're 
being outsourced).

You haven't mentioned the sup version - at a minimum you want to look 
at either the MLS cache or the hardware FIB & ADJ entries, maybe the 
L2 table, etc.

Tim

At 08:12 PM 9/25/2005, Jeff Kell mused:
>I have now been through the *third* occurrance of a very strange 
>communications hangup involving a WS-X6348 blade  and, at various 
>stages, a PIX 515E and a 2611.  It is one of those non-reproduceable 
>things that is hard to troubleshoot (at this point TAC would 
>probably shrug this one off).  Any clues appreciated.  I'll try to 
>make a long story short...
>
>Communication stops on a point-to-point (/30) link with the 
>neighboring device (100TX link on both ends of a short jumper 
>cable).  No ping response from either end.  Tried changing 
>cables.  Tried changing ports.  Tried clearing ARP.  Tried clearing 
>mac-address tables.  Tried clearing interfaces.  No dice.  The other 
>device can not communicate with the 6509.  If relevant, IOS is 12.1(26)E1.
>
>Other interfaces, routing protocols, operation are unaffected.
>
>6500 sees the neighbor and has it in ARP table.
>Other end does not see the 6509's MAC (ARP entry 'incomplete').
>Tried static MAC in the other end to no avail.
>
>Reloading the 6509 'often' clears it, power-cycling always does.
>Reloading the other device almost never clears it.
>Power-cycling the other device sometimes clears it.
>
>I can't reliably reproduce it, and since this is production 
>hardware, I can't spend much time troubleshooting it (unless the 
>'other' device is not critical, as was the case with the 2611 recently).
>
>Ring any bells?
>
>Jeff
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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