300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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QuestionQ40

Multicast Routing

Refer to the exhibit.

Question Image

The UserA device does not receive IPTV streaming traffic from the source. During troubleshooting, a network engineer determines that routers RB and RC receive the multicast traffic normally. RC receives subscription messages from UserA to join the IPTV stream. What action must the engineer take on router RA to correct the issue?

  • A Change ip igmp version 2 to ip igmp version 3 on interface GigabitEthernet 1/0.
  • B Remove the ip pim ssm default configuration and replace it with ip pim rp-address 10.10.10.3.
  • C Configure ip pim bidir-enable in global mode and add ip pim rp-address 10.10.10.3.
  • D Configure ip pim ssm with ip igmp version 2 on interface GigabitEthernet 1/0.
Explanation

Source-Specific Multicast requires IGMPv3 on receiver-facing interfaces so receivers can signal the source-and-group (S,G) channel subscription. With ip pim ssm default enabled, IGMPv2 cannot provide that source-specific membership information; enabling IGMPv3 on GigabitEthernet1/0 allows UserA’s SSM subscription to be processed. An RP is not used for SSM.

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