[c-nsp] Input errors, overrun & unknown protocols drops on LAN interface

[David Prall]

To minimize the input drops you can increase the hold-queue. Another issue
to look at is the buffers as well, most likely have misses and failures
there. The flushes are caused by SPD, which are control plane packets that
need to make it to the processor so they are put ahead of everything else in
the input queue.

David, a different one.

--
http://dcp.dcptech.com


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Farooq Razzaque
> Sent: Tuesday, September 13, 2011 9:18 AM
> To: david.rothera at gmail.com
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Input errors, overrun & unknown protocols drops on
> LAN interface
> 
> 
> Dear David
> 
> How can we resolve this then
> 
> 
> 
> 
> 
> 
> 
> 
> 
> > Subject: Re: [c-nsp] Input errors, overrun & unknown protocols drops
> on LAN interface
> > From: david.rothera at gmail.com
> > Date: Tue, 13 Sep 2011 14:04:57 +0100
> > CC: nick at foobar.org; cisco-nsp at puck.nether.net
> > To: farooq_mcp at hotmail.com
> >
> > Input drops are usually caused by the input queue filling up and then
> tail drops occurring because there is no more space for new packets in
> the queue.
> >
> > I've seen this happen where you have an upstream device trying to
> send packets faster than the downstream device can process them.
> >
> >
> > On 13 Sep 2011, at 13:54, Farooq Razzaque wrote:
> >
> > >
> > > Dear Nick
> > >
> > > Thanks for your reply.
> > >
> > > What does input error means ?
> > >
> > > I am also having the drops in Input queue
> > >
> > >
> > >
> > > Input queue: 0/75/3267688/769 (size/max/drops/flushes); Total
> output drops: 0
> > >
> > >
> > >
> > >
> > >
> > >
> > >> Date: Tue, 13 Sep 2011 12:18:05 +0100
> > >> From: nick at foobar.org
> > >> To: farooq_mcp at hotmail.com
> > >> CC: cisco-nsp at puck.nether.net
> > >> Subject: Re: [c-nsp] Input errors, overrun & unknown protocols
> drops on LAN interface
> > >>
> > >> On 13/09/2011 10:13, Farooq Razzaque wrote:
> > >>> I am facing the input errors, overrun & unknown protocols drops
> on LAN
> > >>> interface-Gi0/0 (having sub-interface) on MPLS router.
> > >>
> > >> port overruns mean that your router is receiving data faster than
> it can
> > >> handle. You either need a faster router than a 3800 series or else
> larger
> > >> input buffers.
> > >>
> > >> Unknown protocols means that your switch is sending data that the
> router
> > >> doesn't understand. Maybe LLDP or something? Or some other odd LAN
> protocol?
> > >>
> > >> Nick
> > >
> > > _______________________________________________
> > > cisco-nsp mailing list cisco-nsp at puck.nether.net
> > > https://puck.nether.net/mailman/listinfo/cisco-nsp
> > > archive at http://puck.nether.net/pipermail/cisco-nsp/
> >
> 
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