[c-nsp] giant packets troubleshooting

Michalis Palis security at cytanet.com.cy
Tue Jul 15 02:22:14 EDT 2008


On one link for example where  we have an etherchannel between a GSR and a 
4510 switch, we see a lot of giant packets on the router side and no giant 
packets on the switch side


----- Original Message ----- 
From: "Pavel Skovajsa" <pavel.skovajsa at gmail.com>
To: "Michalis Palis" <security at cytanet.com.cy>
Cc: <cisco-nsp at puck.nether.net>
Sent: Tuesday, July 15, 2008 9:09 AM
Subject: Re: [c-nsp] giant packets troubleshooting


> Just to be aware, there has been a cosmetic bug on many cisco
> platforms two years ago that clasified all dot1q trunked frame as
> giants. The way to see verify this is by looking whether you don't see
> giants on all trunk ports.
>
> Pavel
>
> On Tue, Jul 15, 2008 at 7:56 AM, Michalis Palis <security at cytanet.com.cy> 
> wrote:
>> Hello all
>>
>> I have some interfaces on my networks (gigabit / ethernet) which report a 
>> huge amount of giant packets. What is the cause of giant packets?  Is 
>> their any methodology or any good document which details the way to 
>> troubleshoot giant packets?
>>
>> All responses will be appreciated.
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