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  • 1.  Use of VPLS mesh-group

     
    Posted 07-16-2014 06:56

    Hi All !

     

    I would like to have some exemple for using multiple VPLS (LDP) Mesh-Group ? Why would need this ?

     

    The only example I see is if I want some mesh group to have "local-switching" activate and some other not.

     

    Any other design ?

     

    Thank you !

     

    Salah

     

     



  • 2.  RE: Use of VPLS mesh-group
    Best Answer

    Posted 07-21-2014 11:57

    Hello,

    Please see RFC 4762 section 10.1.1

    http://tools.ietf.org/html/rfc4762#section-10.1.1

     

    For each VPLS service, a single spoke PW is set up
   between the MTU-s and the PE-rs based on [RFC4447].

     Hence, PE1-rs has a full PW mesh on right side (2 PW, 1 towards PE2-rs and 1 towards PE3-rs) and >1 PW in hub-spoke fashion on left side, towards MTU-s (1 per VPLS service). Therefore, to provide VPLS services, PE1-rs has to pass Ethernet frames between right-side PW and left-side PW. By default, to achieve loop-free VPLS operation, passing frames between PW is prohibited.

    To allow that, different PW requiring frame passing between themselves have to be put in different mesh-groups.

    HTH

    Thanks
    Alex



  • 3.  RE: Use of VPLS mesh-group

     
    Posted 07-23-2014 06:10

    Good example ! Thank you !

     

    What about the same config, with one mesh group and local-switching activated ?

     

    Thanks !

     

    Salah



  • 4.  RE: Use of VPLS mesh-group

    Posted 07-23-2014 09:16

    Hello,

     

    @Daboss wrote:

     

     

    What about the same config, with one mesh group and local-switching activated ?

     



    Are You asking about topology as in http://tools.ietf.org/html/rfc4762#section-10.1.1 ? If yes,

    You certainly don't want to flood BUM back into PE mesh, or BUM traffic from CE-1 to CE-2/CE-3.

    Therefore PE1-rs needs 2 mesh-groups (just to switch frames from left-facing PW mesh-group to right-facing PW mesh-group and vice versa) and no local-switching between individual PW in right PW mesh-group.

    You may want to use local-switching in the left-facing PW mesh-group depending on the service type(any-to-any or hub-spoke).

    HTH

    Thanks
    Alex