QuestionQ116

Multicast Routing

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Refer to the exhibit. Routers R1, R2, R3, and R4 are peer routers in separate administrative domains. PIM-SM runs in every autonomous system, and EBGP is configured between the peers. A network administrator has just implemented MSDP between the directly connected peers. After the MSDP configuration was enabled, R1 and R2 did not establish a peering relationship. All other connected routers successfully formed peering sessions. What action must the engineer take to resolve the issue between R1 and R2?

  • A Implement BGP authentication between the peers.
  • B Configure the peers to be in the same autonomous system.
  • C Change the MSDP authentication method to clear text.
  • D Set the same MSDP password on both peers.
Explanation

MSDP MD5 authentication requires both endpoints of an MSDP peer session to be configured with the same password; if the passwords differ, the TCP-based MSDP connection cannot be established.

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