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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Chapter 11

1. As which kind of port type can the customer-facing Ethernet interface on the PE router be configured?
A1: Answer: The customer-facing Ethernet interface on the PE router can be configured as any of the following:

- An access port

- An 802.1Q trunk port

- A dot1qtunnel port

2. How many labels are used to forward VPLS traffic, and what is the use of each of those labels?
A2: Answer: Two labels are used to forward VPLS traffic. The top label, or tunnel label, identifies the tunnel (LSP) that the frame belongs to. In other words, it forwards the frame from the local or ingress PE to the remote or egress PE. The bottom label is the VC label. It identifies the pseudowire. In other words, the VC label is looked at by the remote PE; it ...

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