[c-nsp] PA-GE - Incrementing Ignored and Overrun Errors

[Rodney Dunn]

What does 'sh diag' say?

We don't support putting a GE PA in a VIP.

You had to buy a full slot card which was either a GEIP or
GEIP+.

Those old cards can't do linerate GIGE (ie: high microburst on a GIGE port).

Been a while...the GEIP was vip2-50 based and the + was VIP4-80 based
IIRC. Latter is much faster.

Rodney




On Tue, Feb 24, 2009 at 02:52:05PM -0500, Gregory Boehnlein wrote:
> Hello,
> 	We have a 7507 w/ Dual RSP-4's running 122-25.S12. It's been up and
> working w/out a problem for 50 weeks at this point. Over the past few days,
> our Gig-E fiber trunk to Level-3 has been exhibiting an unusual amount of
> packet loss when our BGP sessions are up. From a traffic perspective, we are
> only sending/receiving about 30 Megabits / second across this interface.
> When we drop the BGP session w/ X/O and ping across to their BGP peer,
> everything is fine. When we have BGP enabled, there are no input errors, but
> we do see incrementing numbers in the Overrun and Ignored fields. According
> to the Cisco Ethernet troubleshooting documentation, this means the
> following:
> 
> Overrun Errors
> --------------
> Description: The number of times the receiver hardware was unable to hand
> received data to a hardware buffer.
> Common Cause: The input rate of traffic exceeded the receiver's ability to
> handle the data.
> 
> And..
> 
> Ignored Errors
> --------------
> Description: Cisco IOS sh interfaces counter. The number of received packets
> ignored by the interface because the interface hardware ran low on internal
> buffers.
> Common Causes: Broadcast storms and bursts of noise can cause the ignored
> count to be increased.
> 
> Any suggestions on where to look? Level 3 is dispatching to do end-to-end
> testing on their Fiber interconnect. I'd like to get an idea of what sort of
> broadcast traffic I might be seeing on the port...
> 
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