4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ147

Large scale VPLS deployments

Consider a large metro-to-metro VPLS network interconnected by a mesh of mesh-SDPs. Which of the following statements does not apply to this situation?

  • A Bandwidth and replication inefficiency can occur on inter-metro links if there is a lot of multicast traffic
  • B The number of control sessions grows exponentially in a fully meshed network.
  • C Spanning-tree is required to prevent loops when using mesh SDPs on the inter-metro links.
  • D Network touches increase with each node added to the mesh.
Explanation

A fully meshed VPLS core uses split-horizon forwarding: traffic received from a mesh SDP is not forwarded to other mesh SDPs in the same service. This makes the mesh-SDP core loop-free without requiring a spanning-tree protocol; STP is used for applicable redundant customer-facing or spoke/access topologies, not to prevent loops within the mesh-SDP core.

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