QuestionQ11

Layer 2 VPNs

While troubleshooting an AToM L2VPN service, a network consultant finds that the AC Layer 2 encapsulations differ. What action should the consultant take to make the MPLS L2VPN function?

  • A tag-rewrite on the ingress and egress PE router
  • B interworking IP configuration on the last PE router before label disposition
  • C nonrouted interworking setup to properly translate only the Layer 2 information from the AC
  • D interworking IP configuration on both the AC terminations on the PEs
Explanation

AToM interworking is required to connect heterogeneous attachment circuits. IP (routed) interworking terminates each local Layer 2 encapsulation at its PE and carries the resulting Layer 3 packets over the pseudowire; the interworking ip pseudowire setting must be configured consistently at both PE endpoints.

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