[c-nsp] Gigabit Interface Input Errors

[Darin Herteen]

Unfortunately I don't know of anyway to check the hardware buffer(s), and my "guess" is per line card. 

I would also run a "show process cpu" while the overruns incrementing (if you can) to see if the utilization is above 90%. I've heard of this causing overruns in the past. I haven't experienced it myself though.

From: drew.weaver at thenap.com
To: synack at live.com; cisco-nsp at puck.nether.net
Date: Thu, 5 Nov 2009 13:58:06 -0500
Subject: RE: [c-nsp] Gigabit Interface Input Errors



















Thanks for responding,

 

As far as you're aware is there a way to check the hardware
buffer to see if this is the case, and is this buffer usually per line card, or
per slot (both/either?)

 

-Drew

 

 





From: Darin Herteen
[mailto:synack at live.com] 

Sent: Thursday, November 05, 2009 1:54 PM

To: Drew Weaver; cisco-nsp at puck.nether.net

Subject: RE: [c-nsp] Gigabit Interface Input Errors





 

Drew,



Overruns are usually caused by the receiving hardware
buffer being "flooded" for lack of a better term because the input
rate exceeded the receiver's ability to handle the traffic. 



Darin



> From: drew.weaver at thenap.com



> To: cisco-nsp at puck.nether.net

> Date: Thu, 5 Nov 2009 13:41:16 -0500

> Subject: [c-nsp] Gigabit Interface Input Errors

> 

> Hi,

> 

> I noticed I'm seeing some Input errors on a gigabit ethernet interface:

> 

> 70 input errors, 0 CRC, 0 frame, 70 overrun, 0 ignored

> 

> the number of input errors seems to increment along with the overrun
counter which I assume means that the actual errors are overrun errors.

> 

> Does anyone have any tips on finding out what is causing it to overrun?

> 

> My first inclination is to assume it is not a huge problem because of the
amount of packets that are flowing through this interface:

> 

> 2367831951 packets input, 247924231216 bytes, 0 no buffer 70 out of
2367831951 is a fairly small number but I wanted to check and see if you all
had any thoughts.

> 

> thanks,

> -Drew

> 

> 

> 

> 

> 

> 

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