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

[David Rothera]

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
> 		 	   		  
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