QuestionQ5

Multicast Routing

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Refer to the exhibit. The service provider has deployed segment routing in its core. P2 connects to P3 and P4 through a point-to-multipoint link, as shown. The service provider supplies connectivity for a large enterprise with three primary offices in different geographic regions. Each office connects through one of the three PEs. The enterprise wants to implement multicast traffic across the service provider to stream mission-critical applications among sites. The applications are sourced from a server connected to the network through PE2. Which action must the network-engineering team take so that multicast traffic flows between the enterprise sites over the point-to-multipoint link?

  • A Implement MLDP to allow multicast traffic to f ow within the single AS.
  • B Implement SR Tree-SID to build a multicast replication tree over the point-to-multipoint link.
  • C Implement RSVP to reserve bandwidth on the link between PE2 and P2.
  • D Implement PIM-DM to flood multicast traffic from the enterprise into the service provider core.
Explanation

SR Tree-SID builds an SR point-to-multipoint multicast replication tree. A replication segment forwards and replicates traffic toward the required downstream nodes, enabling efficient multicast delivery across the SR core without using traditional multicast control protocols such as RSVP, mLDP, or PIM.

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