4A0-C03: Nokia NRS II Composite Exam: IS-IS versionDemo

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QuestionQ18

Multiprotocol Label Switching

The following output is from router R4. Service 333 is a VPLS. Why could peer 10.10.10.1 have the identical value for IngLbl and EgrLbl?

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  • A The labels are of local significance only, so other routers can use the same value.
  • B 10.10.10.1 has yet to send its own unique label.
  • C Router R4 is using the same tunnel to send and receive to 10.10.10.1.
  • D The service on 10.10.10.1 is down, so it is rejecting packets.
Explanation

MPLS labels have local significance: each LSR can allocate a label value independently within its own label space. The ingress and egress service labels for the peer can therefore happen to use the same numeric value without any conflict or service problem.

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