Does the 3745 1FE2W Module Support MPLS?

[wpalumbo06]

Hello,

I have a couple of these routers in the lab with a very basic MPLS configuration on them.  Everything works fine on the fixed interfaces but I cannot get the ldp neighborship to form between the 1FE2W interfaces on each router.  Does this module support MPLS?

Thanks...

[Peter Paluch]

Hi,

I do not know for sure about this module. Then again, for these routers, the MPLS is a software feature so a hardware Layer2 module should not be limited (or limiting) in any way.

One key thing to consider: the LDP chooses a Router ID much like the OSPF does. However, at least in Cisco implementation, the LDP actually uses this Router ID as a source/destination IP address in the LDP communication. This means that if a router has chosen a particular LDP RID, its neighbors must be able to resolve that RID in their routing tables, otherwise, the neighbors won't be able to start a LDP adjacency.

I suggest using the mpls ldp router-id force command to make sure that the LDP RID is set to a particular interface's IP address, and then making sure that this IP address is advertised to other routers via a routing protocol.

Best regards,

Peter

[wpalumbo06]

I agree that interface should not matter but it's the only thing different in the configuration.  I'll try forcing the router ID and see what that does.

Thanks...

[wpalumbo06]

Well...I decided to blow away both router configs and rebuild them

from scratch...everything works fine now.  I must have configured something wrong the first time but I can't imagine what - configuring MPLS between two routers isn't exactly rocket science...or isit:-)

Thanks again.