A company's HP Provision ASIC switches are configured to use PIM-SM mode to provide multicast services. When an HP Provision ASIC switch receives a multicast stream, it determines that the best path…

Question

Options

• AThe switch may use the backup RP if this RP is in the path between the multicast source and its receivers.
• BThe switch may send a graft message on the interface through which it reaches the multicast source.
• CThe switch may establish itself as the new RP for the shortest path tree.
• DThe switch may decide to join the shortest path tree.

• A
  4% (1)
• B
  8% (2)
• C
  16% (4)
• D
  72% (18)

Explanation

Shortest-Path Tree Operation. In the default PIM-SM configuration, after an edge router receives the first packet of traffic for a multicast group requested by a multicast receiver on that router, it uses Reverse Path Forwarding (RPF) to learn the shortest path to the group source. The edge router then stops using the RPT (Rendezvous-Point Tree) and begins using the shortest path tree (SPT) connecting the multicast source and the multicast receiver. In this case, when the edge router begins receiving group traffic from the multicast source through the SPT, it sends a prune message to the RP tree to terminate sending the requested group traffic on that route. When completed, the switchover from the RPT to a shorter SPT can reduce unnecessary traffic concentrations in the network and reduce multicast traffic throughput delays.

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