[c-nsp] 6704-10GE huge input drops (flushes)

[Antonio Soares]

I was exactly looking to this document:

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note0918
6a00804916e0.shtml#utilities

Where the SPAN and the command you mentioned are.

But the document mentions a surprising thing:

"In this output, you can see that the incoming traffic is Layer 3-switched
instead of Layer 2-switched. This indicates that the traffic is being punted
to the CPU."

This is not correct, right ? In my case I just see the L3 in/out Switched
value increasing.


Regards,

Antonio Soares, CCIE #18473 (R&S/SP)
amsoares at netcabo.pt
http://www.ccie18473.net



-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dale
W. Carder
Sent: terça-feira, 7 de Maio de 2013 20:37
To: Saku Ytti
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 6704-10GE huge input drops (flushes)

Thus spake Saku Ytti (saku at ytti.fi) on Tue, May 07, 2013 at 02:23:27PM
+0300:
> On (2013-05-07 12:11 +0100), Antonio Soares wrote:
> 
> > Yes, back-to-back L3 interface to a GSR. No MPLS, no sub-interfaces.
Only IPv4/IPv6 addressing and ISIS there.
> > 
> > When the last occurrence happened, we saw an increase of 5 million
drops.
> > 
> > It's a sporadic thing, it lasts a couple of minutes then everything
returns to normal.
> 
> I would probably setup ERSPAN of SP/RP traffic and wait for drop 
> counter to increase and see if I have something dodgy on capture.
> But I'm bit worried if they're seen by that capture, as drop equals 
> flush precisely.

You could also run "show buffers input-interface <blah> dump" to see what is
getting punted.

Dale
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