Spanning Tree BPDU over VPLS

jhakas · July 20, 2014, 11:43am

I’ve lab setup with 3 PE (VPLS configured) and each on mesh connectivity. Each PE got connectivity to respective switch and the switch are connected to each other for redundancy. Now the link to PE from switch shows *PVID_Inc. If someone has been through such an issue, please help! I think this is an issue with BPDU processing via pseudo-wires. So, help me how can I pass the BPDUs across VPLS cloud. Your help will be highly appreciated!!

samsung172 · July 20, 2014, 12:09pm

VPLS should transport all frames without anny issues regarding (r)stp etc. All layer2 frames should pass trough as long as l2mtu is not to big for MPLS cloud.

How is the taggd frame put into the vpls tunnel? is the vlan tagged on the mikrotik Device? what is l2mtu to tunnel/MPLS cloud? what is Maximum physic l2mtu to Interface in mpls cloud.

jhakas · July 20, 2014, 4:49pm

l2mtu to tunnel/MPLS cloud is 1526 & physical l2mtu to Interface in mpls cloud is same as well.

CelticComms · July 20, 2014, 7:57pm

Are you sure that you have ruled out native VLAN inconsistencies an all the relevant ports?

samsung172 · July 20, 2014, 8:39pm

How about the Device you Connect to mikrotik?

jhakas · July 21, 2014, 4:19am

I’d connected the 3 Cisco 2950 connected to each other and 2 switch upstream port are connected to PE. The port which are connected to PE are shown INC in switch.

CelticComms · July 21, 2014, 10:44am

What are the switchport settings on the switch ports?

jhakas · July 21, 2014, 4:32pm

All switch to switch & connection are set with Trunk and all allowed vlan.

samsung172 · July 22, 2014, 1:30pm

but l2mtu? - cisco default is 1500 - you have to change to something more.

jhakas · July 23, 2014, 5:21am

I think its not a case about L2mtu as i can ping & pass data via cloud but my problem is spanning tree inconsistent. how can i pass the native vlan via mikrotik ? any one…

CelticComms · July 24, 2014, 6:21pm

Which status message are you actually getting? The one you first posted is usually a native VLAN ID inconsistency.

jhakas · July 25, 2014, 5:26am

My native vlan is 1 & other vlan shows inconsistency.. if i have just one vlan (say vlan 250) then spanning tree work but when i add multiple vlan on switches it began show inconsistency in all except vlan1.

samsung172 · July 25, 2014, 7:32am

well. If l2mtu is 1500 and Your MPLS is 1526 - you will get dropped VPLS frames - and it will have strange behavior It can Connect and all seems ok, and just start to drop frames.