Hi everyone
I got a problem when I trying to configure MPLS use GNS3 1.0 beta 2 .
When i use two L3 IOU devices and connect them directly the mpls works ok, but if i put one L2 IOU device between them the MPLS neighbor status will become DOWN.
I try to capture the MPLS HELLO packet , it turns out that the L2 IOU device can receive the packet which destination is 224.0.0.2 but can not send it.
I don't konw if anyone else got this problem or not , but if it dose I hope there is some way to fix this problem.

I believe this should be a bug with l2iou as it does not forward multicast by default. I have not really find a work around using IOU but one easy fix is to use c3725 etherswitch network module interface..this should work. the neighbourship will come up...

Yeah this happened to me too. I was trying to run some mpls lab using 7200's and IOU switches. When i connect the routers directly mpls works fine. When i use IOU switches only IGP works since im using ospf to propagate loopbacks to each other but when it comes to mpls it just dont form ldp neighborships. Im using beta 3 kinda dissapointed. L2 IOU images i used to test this were:
i86bi-linux-l2-adventerprise-15.1b
i86bi-linux-l2-ipbasek9-15.1g

I guess i'll have to practice this lab in gns3 0.8.x