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 software can support up to 16 mesh groups on MX-series routers and up to 128 on M-series and T-series routers. However, 2 mesh groups are created by default, 1 for the CE routers and 1 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. PE router mesh groups are not supported on J-series routers.

The following describes the default behavior of mesh groups in regards to BGP-signaled PE routers discovered automatically and LDP-signaled PE routers configured statically:

• 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 software to associate these routers with a user-defined VE mesh group.
• LDP-signaled PE routers—PE routers statically configured using forwarding equivalence class (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.

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