[afnog] Problem bringing up MPLS on disimilar interfaces

[John Tully]

Probably the VPLS pseudowire fragmentation and reassembly 
(<http://tools.ietf.org/html/rfc4623>RFC 4623) can help when the 
interfaces don't support the frame size.  This is supported in RouterOS.

John


At 02:54 PM 9/20/2008, Mark Tinka wrote:
>On Saturday 20 September 2008 03:08:31 Frank A. Kuse wrote:
>
> > I am having some trouble bringing up MPLS up on disimilar
> > interfaces ( FastEthernet Interface and Gigabit interface
> > both connecting to a cisco 3750 switch with Jumbo frames
> > enabled)
>
>Note that if these are Cisco routers, with the exception of
>the high-end kit (i.e., 7600, XR 12000, CRS-1), Cisco don't
>generally support baby giant or jumbo frames on their FE
>cards (although we are now seeing support for being able to
>change the MTU on FE interfaces on the 7200 for much more
>recent code).
>
> > When i change the Gigabit interface to a FastEthernet
> > interface, the MPLS comes up.
>
>Could we see some of your configurations on both routers
>(I'm assuming these are Cisco)? If possible, can you send?
>
>* sh run int <interface>
>* sh int <interface>
>* sh mpls interfaces
>* sh mpls ldp neighbor
>
>It'd be good to also look at your IGP configuration.
>
>Recommend that you also have these commands by default in
>your global configuration:
>
>* mpls label protocol ldp
>* mpls ldp router-id Loopback0
>
> > I would like to know if it's possible to bring up MPLS up
> > between two disimilar interfaces.
>
>It is possible - I've done it before.
>
>Cheers,
>
>Mark.
>
>
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