From: Mark Mckillop \(mmckillo\) (mmckillo@cisco.com)
Date: Sat Jun 23 2007 - 17:06:35 ART
A nice option also is to do:
system mtu routing 1500
This will avoid you needing to use the mtu-ignore command, although it
only works on the 3560's. It doesn't require a reboot either. Just
ignoring something always feels like a bad thing thing to do :)
Mark.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Antonio Soares
Sent: 23 June 2007 17:58
To: 'Radioactive Frog'; johngibson1541@yahoo.com
Cc: ccielab@groupstudy.com
Subject: RE: RE: MTU Mismatch in OSPF
+++++++++++++++++++++++++++++++++++++++++++++++++++
The 3560 default is 1500:
Switch#sh flash
Directory of flash:/
2 -rwx 7963038 Mar 1 1993 00:57:27 +00:00
c3560-advipservicesk9-mz.122-25.SEE2.bin
32514048 bytes total (24549888 bytes free) Switch# Switch# Switch#sh
flash
+++++++++++++++++++++++++++++++++++++++++++++++++++
Directory of flash:/
2 -rwx 7963038 Mar 1 1993 00:57:27 +00:00
c3560-advipservicesk9-mz.122-25.SEE2.bin
32514048 bytes total (24549888 bytes free)
Switch#sh system mtu
System MTU size is 1500 bytes
System Jumbo MTU size is 1500 bytes
Routing MTU size is 1500 bytes
Switch#
+++++++++++++++++++++++++++++++++++++++++++++++++++
But the way, when you have an OSPF Mtu Mismatch, where you do add the
"ip ospf mtu-ignore" command ?
1) The device with the lower Mtu.
2) The device with the higher Mtu.
3) Both devices.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Radioactive Frog
Sent: sabado, 23 de Junho de 2007 5:23
To: johngibson1541@yahoo.com
Cc: ccielab@groupstudy.com
Subject: Re: RE: MTU Mismatch in OSPF
dats sound strange to me!
frog
On 6/23/07, johngibson1541@yahoo.com <johngibson1541@yahoo.com> wrote:
>
> I think 3550's MTU at 1504 is caused by a file flash:env_vars
>
> If I remove this file, then reload it will become 1500.
>
> My 3560 is a different story. It is 1504 by itself.
>
> Strangely, univercd keeps talking about 3560 and 3550 default mtu
> being 1500. They are just not saying the correct thing.
>
> 3560 at 12.2(25) , 12.2(35) , and the latest 12.2(37) all make the
> same mistake!
>
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