VPLS Signaling

VPLS requires a full mesh of pseudowires between PE routers for each VPLS instance. When you configure the VPLS instance on the PE router, you must also specify the VPLS neighbors of this PE router. That means you must specify all the remote PE routers for this PE router for that one VPLS instance. The PE routers then form a targeted LDP session between them in a full mesh. The targeted LDP session signals each VC or pseudowire between a pair of PE routers and advertises the VC labels. If a VPLS instance is assigned to a VLAN interface on the local PE router, a local VC ID is assigned to the VPLS instance. The VC ID is the VPN Identifier (VPN ID) that you must assign to a VPLS instance by means of configuration. Each pseudowire between a pair of PE routers for that VPLS instance has that VC ID. However, the local VC label that the router assigns for that VPLS instance is different for each pseudowire. Figure 11-5 shows the VPLS signaling.

Cust-one

Cust-one

Cust-one

Cust-one

LDP

VPLS

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Targeted LDP Sessions Between PE Routers

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