[c-nsp] Cisco Bug CSCei46978

[Bruce Pinsky]

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Paul Stewart wrote:
> Hi there...
> 
> We've been getting hit by Bug ID CSCei46978 which reads:
> 
> "Symptoms: A Cisco 7200 series may generate the following error message,
> and 
> links flap:
> 
> %SBETH-3-ERRINT: GigabitEthernet0/1, error interrupt, mac_status = 
> 0x0000000000840000
> 
> Conditions: These symptoms are observed on a Cisco 7200 series that runs
> 
> Cisco IOS Release 12.3(15) and that is configured with an NPE-G1.
> 
> Workaround: There is no workaround. Note that the symptom does not occur
> in 
> Release 12.3(13)."
> 
> We're running 12.4(7a) (C7200-JK9S-M) and it's supposed to be fixed...
> Anyone else run across this by chance?
> 
> The Cisco site says "First Fixed-in Version  12.2(30.9)S, 12.4(4.2),
> 12.3(16.7), 12.4(4.4)T" so we shouldn't be seeing it...  
> 

12.4(7a) definitely contains the fixes as described in the bug you
mentioned above.  As you've seen the Release Note is scant on details.
Suffice to say, the problem fixed in that particular bug was a situation
where a packet was ingressed that had a bad length and the size of that
packet in memory was exactly one particle buffer.  In that particular
situation, some additional checks were erroneously bypassed (like the check
for length and alignment) causing the controller to be reset when the
actual length of the packet did not match the reported size of the packet.

That particular mac_status setting is only an indicator that a particular
bit of a particular register is set. The setting of that bit can occur in
multiple situations.  It may be that you are encountering a different
scenario than the one fixed in the bug you cited that results in that
register being set and the error message resulting.

I've found other bugs with similar error messages to yours, but none seem
to fix your hardware/software combination.  You should probably open a case
with the TAC to investigate the cause.

- --
=========
bep

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