[c-nsp] MTU size with EoMPLS

[Arie Vayner (avayner)]

Guys,

I suggest you take a look at this one:
http://www.cisco.com/en/US/partner/docs/ios/12_2sb/feature/guide/newmtu.
html

BTW, the high MTU has to be configured end to end between the PE's - not
only on the PE's core facing interface.

Arie 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: Saturday, March 01, 2008 00:46 AM
To: lobo at allstream.net
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] MTU size with EoMPLS

On Fri, 2008-02-29 at 16:07 -0500, The Father wrote:
> Thanks for the tips Peter.  Is "ip mtu xxx" on an interface the same 
> as using "mtu xxx"?  Seems like I don't have the ability to change the

> mtu on some of the linecards of the 7600.

You're welcome. IP MTU and interface MTU is not the same I'm afraid.
Things like MPLS and CLNS are not IP, and have their own "<proto> mtu X"
configuration command. Some interfaces, like FE interfaces, typically do
not support large frames. If you're lucky they will accept "baby
giants", something like 1530 bytes or so. If you cannot change the
interface MTU, the interface probably doesn't support large frames.

Regards,
Peter


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