Chapter 7 Review Questions & Answers
| 1: | What is the innermost label in the label stack of a packet sent over an AToM pseudowire? |
| A1: | Answer: The innermost label in the label stack is the VC label. This label is used by the egress PE router to associate the Layer 2 PDU carried in the packet with the correct attachment circuit. |
| 2: | How do the peer PE routers discover each other? |
| A2: | Answer: They use extended (unicast UDP port 646) LDP discovery. |
| 3: | How do the peer PE routers advertise VC labels to each other? |
| A3: | Answer: They form an LDP neighbor relationship and exchange label mapping messages. |
| 4: | If an attachment circuit changes state to down, how does the PE router indicate this state change to its peer PE router? |
| A4: | Answer: It sends an LDP label withdraw ... |
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