I know that this has been asked previously and I can’t seem to get a definitive answer on this… so I would like to ask the question using the below diagram. Try to do a simple setup here.
The part of the MTU Question I think I’m getting lost at is.. MTU is listed in 5 different places .. and want to ensure what I’m trying to modify is not the wrong one.
I need to setup a MPLS/VPLS private lan connection From R1 to R3
Routers Have OSPF setup and all routers are aware of each other..
LDP is enabled on loopback/Bridge interface
MPLS Interfaces are ONLY the Main interfaces not the Vlans
LDP Interfaces are the VLANS Only NOT the main interface.
Routers can see each other in LDP neighbors
VPLS interface is setup between router R1 and R3 .
R1 and R3 Both have a Bridge setup with the VPLS interface Port 5 on each router. the endpoint computers A & B This seems to be working although Just because its working doesn’t mean it was done correctly.
Is there a more correct setup?
VPLS-DIAGRAM.jpg
The most important part, besides MPLS/VPLS is running, is the L2MTU on the physical interfaces. It must be at least the size of your MPLS MTU. You configured the MPLS MTU to 1530 which is fine when the physical interfaces on your routers support an L2MTU of at least 1530 and all your devices between your routers support this MTU too.
The L2MTU on all the physical interfaces are 5198 .. so that should be safe.
Another question. I don’t need to have the VLANS that the routers are peering on in the MPLS Interface? Just in the LDP Interfaces? should I have them in both… this is where things get confusing on where they should be added.
the VPLS setup Mikrotik has on the site doesn’t include vlans in the setup so It left some questions.
Again, it seems to be working but want to know what is best practice.
Also is there any Debugging available for LDP? I see the options in the logs but don’t seen anything posting to the logs when there are problems.
There was not documentation on how to include the vlans into the ldp and mpls setup.
This link shows how to setup the VPLS connection on basic router to router
Although if their is a switch and vlans in between the routers… I doesn’t explain how you would set the vlans in the LDP interface and the MPLS interfaces.
Been running through the logging/debug of LDP, it doesn’t give much output.
I have this working fine in a test bed environment. When I implemented it on live network, the VPLS interfaces didn’t come up..
R1 says “Running,Slave” R3 says “Slave”
NOTE: I think I mislabeled the pic at the beginning of post.. R1 is on left R2 in the middle top and R3 on the right(sorry)
Now if I wait about 45 minutes the 2 will come up to “Running,Slave” also
Very weird… but I can’t wait 45 min for it to come up in a running environment. so I’m trying to debug it and not seeing any output.