[afnog] Problem bringing up MPLS on disimilar interfaces

[Mark Tinka]

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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