[c-nsp] EoMPLS ?s

[Arie Vayner (avayner)]

Jason,

There is no fragmentation in MPLS. Either you can forward the packet, or
it is dropped.
You need to either have a larger MTU on the core (usually the way it is
implemented today), or reduce MTU at both sides.
As this is a L2 link, you can't use things like MSS adjust etc...

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jason LeBlanc
Sent: Wednesday, October 12, 2011 20:53
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] EoMPLS ?s

We're considering using EoMPLS port mode to bridge two datacenters
together temporarily for a move using sup720-3BXL on both ends with 6724
blades, probably 2 or 4 gig links, possibly 10g if I can get them to buy
the HW.  The question I have primarily is with regard to MTU.  I have
heard there are issues with ensuring both sides match, not much concern
there.  But the network between the two facilities may be lower than the
1518 bytes, causing fragmentation.  I know this gets punted to the RP,
and is going to be a problem.  Is there any work around?

Thanks,
Jason
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