Re: Tunnel Interface MTU issues

I faced this before you must check if there's a switch in the end to end
path you have to jump in this switch and play with system MTU if not it
should be working fine.

in case doing the system mtu in switch watch out save your configs because
its a must to reload and you will found the parser replaying to you when
you change the sys mtu value that the new MTU will take effect after
reload. it easy part but its hard to implement during the business hours
because if you did it in this time you will be fired for sure ;)

Thanks,

On Fri, Jan 17, 2014 at 1:22 AM, Andrew LaPorte <andy_at_cloud9.net> wrote:

> I'm guessing your using a cat switch.
>
> Did you so try:
>
> Fastethernet port "system mtu 1504"
> Gigethernet port "system mtu jumbo 9000"
>
> Documentation:
>
> http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration
> _example09186a008010edab.shtml
>
> Andy
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Dave
> Serra
> Sent: Thursday, January 16, 2014 6:24 PM
> To: ccielab_at_groupstudy.com
> Subject: Tunnel Interface MTU issues
>
> Hey Guys,
>
> I am having MTU issues on a GRE tunnel. Users are sending packets with the
> df bit set and they are being dropped by the Tun0 interface. When doing
> pings I can see that I can only send packets out if they are 1476 (1477
> packets are dropped). I am desperately trying to figure out how to raise
> the "Tunnel transport MTU" from 1476 but it does nothing with the command
> "ip mtu 1500" on the tunnel interace. Can someone please help?
>
>
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