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Cell Relay Retreat>MPLS-OPS Archive>month:2004-Sep> msg00129



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Re: IP Routing problem after enabling MPLS?

  • From: Jon Lewis <jlewis@lewis.org>
  • Date: Sat, 18 Sep 2004 15:23:03 -0400 (EDT)
  • cc: mpls-ops@mplsrc.com
  • Resent-Date: Sat, 18 Sep 2004 15:50:23 -0400
  • X-X-Sender: jlewis@web1.mmaero.com

On Sat, 18 Sep 2004, Garry Glendown wrote:

> Is it just the IOS versions I'm running? How do other people do their
> MPLS? I refuse to believe that everybody running MPLS does so only on
> either GigE, E3, POS or others, but not FE or Eth ... somewhere I read
> that Cisco FEs do not support larger MTUs, but "show cont" will display
> a max MTU of 1524 (while GigE has a Max MTU of 1536, but allows for
> higher sizes in "conf t" ...)

We provide MPLS VPNs over a backbone of T1, T3, and FE circuits.  All
circuits run with an MTU of 1500, except switch ports which get set
higher.  All router interfaces that pass tagged packets have:
 tag-switching mtu 1520
 tag-switching ip


----------------------------------------------------------------------
 Jon Lewis                   |  I route
 Senior Network Engineer     |  therefore you are
 Atlantic Net                |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________

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