![]() ![]() Frames are forwarded to the appropriate pseudowire or attachment circuit according to the forwarding table entry for the destination MAC address. When a frame arrives on a bridge port (pseudowire or attachment circuit) and the source MAC address is unknown to the receiving PE router, the source MAC address is associated with the pseudowire or attachment circuit and the forwarding table is updated accordingly. Each MAC forwarding table instance is interconnected using domain-specific LSPs, thereby maintaining privacy and logical separation between each VPLS domain. A pseudowire contains two unidirectional label-switched paths (LSP). A pseudowire is a virtual bidirectional connection between two attachment circuits (virtual connections between PE and CE routers). Customer Layer 2 frames are forwarded across the MPLS core via pseudowires using IEEE 802.1q Ethernet bridging principles. VPLS defines an architecture that delivers Ethernet multipoint services over an MPLS network. ![]()
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