Re: impact of changing MTU on 6509

Hi Charles,
you r probably right , I didn't gave enough info about the problem.

I was restoring the MTU value back to 1500 using "default mtu" command at
the Interface level.

So I didn't observe any problem ( didn't lost vty, snmp polling/monitoring
to 6509 was ok ). But traffic to all VM and servers connected to my cisco
switch was lost.

I checked my syslog server too, no thing too (no STPD or Supervisor issue
... )

In CiscoBug Toolkit , they didn't talk about any "bad impact" of changing
value of MTU at Interface Level.

has someone faced this kind of problem when dealing with MTU.

Thanks

Maher

On Wed, Jun 9, 2010 at 5:02 PM, <Charles.Henson_at_regions.com> wrote:

> If you changed the MTU then what syslog or trap would you expect? Other
> than if you were archiving command entries via syslog? As for your outage,
> depending on whether you are talking L2 or L3, wouldn't you expect some TCP
> RE-windowing/negotiation? What connection did you lose for 10 seconds?
> Everything? VTY? Please elaborate....
>
> PS: Why change MTU? Only reason I've messed with MTU on my 6509s is for MTU
> issues associated with VMs and blade centers....
>
> Charles Henson
>
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>
> From: ccielight cisco <ccielight_at_gmail.com>
>
> To: ccielab_at_groupstudy.com
>
> Date: 06/09/2010 09:45 AM
>
> Subject: impact of changing MTU on 6509
>
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> Hi all,
>
> Has anyone faced the same problem, it is related to "changing MTU size on
> 10Gb/s Interface", it seems that I loss connection for 10 seconds and I did
> not receive any syslog or traps.
>
> the 6509 has a WS-SUP720-3B and running 12.2(33)SXI ipservices IOS.
>
> the modification of MTU was at Interface level.
>
> Kind Regards,
>
> Maher
>
>
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Received on Thu Jun 10 2010 - 10:48:35 ART