RE: MTU

Hi Gaurav,
As per my understanding Ip mtu will include l3 header (20 byte ip
header) but not l2 header.

Others correct me if I am wrong.

Thanks,
Sonu

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
GAURAV MADAN
Sent: Tuesday, August 31, 2010 10:54 PM
To: Yaseen Mirza
Cc: Cisco certification
Subject: Re: MTU

Well ... I was reading some archives some time back and found that
interface level "mtu " command is the max length of unit that can be
processed and this includes L2 + L3 header length as well

CLI "ip mtu" is size of payload that can be sent and don't include L2
+ L3 header length

Someone please correct me if I am wrong .

Thnx
Gaurav Madan
CCIE # 23863

On Tue, Aug 31, 2010 at 8:42 PM, Yaseen Mirza <yaseengs_at_gmail.com>
wrote:
> Hi
>
> Can someone explain the difference between the following MTUs
>
> From what I can understand there is a hardware MTU.
>
> interface f1/0
> mtu 1500
>
> Then there is an IP MTU for only IP packets
>
> interface f1/0
> ip mtu 1500
>
> The most confusing is vlan MTUs
>
> Under what circumstance does the VLAN MTU come into play For instance
> if I change the MTU under a layer2 vlan what effect does it have and
> how is this different from changing the MTU under an SVI?
>
> Thanks
>
>
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Received on Tue Aug 31 2010 - 23:17:53 ART