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MX240 PE / LNS

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  • 1.  MX240 PE / LNS

    Posted 09-04-2017 09:03



    Quick question....


    Utilsing 4 x MX240 for provider hardware. As this is the provider equipment, with Customers one side and Transit the other, it basically means that all 4 will be provider edge (PE) routers (I may be wrong but don't think so)....


    Naturally I want an MPLS backbone. Is it possible to run MPLS correctly across only PE equipment or are P routers also required? 


    Obviously it makes every PE router Ingress and Egress from an MPLS perspective. With this in mind I also cannot use PHP (Penultimate Hop Popping) of the labels as there is NO penultimate hop.


    I have no issue with the IS-IS and BGP configuration but would like to know about the MPLS. I can, of course, just configure MPLS anyway and see what the results are but would prefer a definative answer.


    One more add on, 2 of the MX240 routers will be acting as LNS (L2TP Network Server) devices.

    Thanks in advance

  • 2.  RE: MX240 PE / LNS
    Best Answer

    Posted 09-04-2017 09:14

    I understand that you want to run topology like this :


    +-----------+                      +--------------+
    |           |        MPLS          |              |
    |    PE1    +----------------------+    PE2       |
    |           |                      |              |
    +-----------+                      +--------------+

    There is no problem with this topology, you can run MPLS without P router as well.


    [KUDOS PLEASE! If you think I earned it!

    If this solution worked for you please flag my post as an "Accepted Solution" so others can benefit..]

  • 3.  RE: MX240 PE / LNS

    Posted 09-05-2017 01:02

    Hi Adwivedi,


    Yes, that's basically the topology.... the exact topology is as follows:



    CE --> PE (LNS) ------> PE (Core)  -----> Transit



    CE --> PE (LNS) -----> PE (Core 1) -----> Transit


    That's great that it still works.