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PE Router Mesh Groups for VPLS Routing Instances

A PE router mesh group consists of a set of routers participating in a VPLS routing instance that share the same signaling protocol, either BGP or LDP. Each VPLS routing instance can have just one BGP mesh group. However, you can configure multiple LDP mesh groups for each routing instance.

The Junos OS can support up to 16 mesh groups on MX Series routers and up to 128 on M Series and T Series routers. However, two mesh groups are created by default, one for the CE routers and one for the PE routers. Therefore, the maximum number of user-defined mesh groups is 14 for MX Series routers and 126 for M Series and T Series routers.

Note:

In the VPLS documentation, the word router in terms such as PE router is used to refer to any device that provides routing functions.

The Junos OS supports both forwarding equivalency class (FEC) 128 and FEC 129. FEC 129 uses VPLS autodiscovery to convey endpoint information. FEC 128 requires manually configured pseudowires.

The following describes the behavior of mesh groups in regards to BGP-signaled PE routers and LDP-signaled PE routers:

  • BGP-signaled PE routers—Automatically discovered PE routers that use BGP for signaling are associated with the default VE mesh group. You cannot configure the Junos OS to associate these routers with a user-defined VE mesh group.

  • LDP-signaled PE routers (FEC 128)—PE routers statically configured using FEC-128 LDP signaling are placed in a default mesh group. However, you can configure a VE mesh group and associate each LDP FEC-128 neighbor with it. Each configured VE mesh group contains a set of VEs that are in the same interior gateway protocol (IGP) routing instance and are fully meshed with each other in the control and data planes.

  • LDP-signaled PE routers (FEC 129)—Configuration for a mesh group for FEC 129 is very similiar to the configuration for FEC 128.

    Note the following differences for FEC 129:

    • Each user-defined mesh group must have a unique route distinguisher. Do not use the route distinguisher that is defined for the default mesh group at the [edit routing-intances] hierarchy level.

    • Each user-defined mesh group must have its own import and export route target.

    • Each user-defined mesh group can have a unique Layer 2 VPN ID. By default, all the mesh groups that are configured for the a VPLS routing-instance use the same Layer 2 VPN ID, the one that you configure at the [edit routing-instances] hierarchy level.

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