Refer to the exhibit. Multicast traffic destined from T1 and T2 routers to RP routers works well. A network engineer observes problems with multicast traffic flows between Site-A and Site-B. Site- A u

Question

Exhibits

Options

• AEstablish MDSP peering with interface IP subnet.
• BConfigure Site-A and Site-B in 10.80.148./24 subnet.
• CAllow the OSPF and MSDP packets on the firewall.
• DConfigure direct OSPF peering between Site-A and Site-B.

• A
  4% (1)
• B
  4% (1)
• C
  78% (18)
• D
  13% (3)

Explanation

The network uses MSDP (Multicast Source Discovery Protocol) for inter-domain multicast RP communication between Site-A (RPTZ) and Site-B (RPTV). For MSDP to exchange SA (Source-Active) messages between the RP routers at each site, MSDP packets (TCP port 639) must be allowed through any firewall between the sites. Additionally, OSPF is needed to establish routing between the sites so that the RP routers can reach each other and the MSDP TCP sessions can be established. If a firewall between the sites is blocking either OSPF or MSDP traffic, both routing and multicast source discovery will fail, causing exactly the described symptom - neither site can receive streams from the other site's RP. Option A (MSDP peering with interface IP subnet) is incorrect because MSDP peers should use loopback addresses, not interface subnets. Option B suggests a subnet change that is unrelated to the described failure. Option D (direct OSPF peering between sites) may already exist - the firewall blocking traffic is the root cause.

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