Question 470
An IPTV receiver joins an SSM multicast channel. Observed: The route never appears despite an active local IGMPv2 membership. After the correction, which result would most convincingly show that this fault is resolved?
Explanation
Correct Answer
After enable IGMPv3 and configure a matching source and group membership, inspect whether the receiver establishes an (S,G) state for the intended channel. This closes the loop between the reported observation (The route never appears despite an active local IGMPv2 membership) and the underlying issue (Source-specific join signaling requires IGMPv3 or supported source filters).
Incorrect Answers
It confirms an unrelated service correction: SSM group-range classification overlaps with the existing ASM service. The present case reports The route never appears despite an active local IGMPv2 membership. Its completion test is The receiver establishes an (S,G) state for the intended channel.
That observation would verify a separate fault involving multicast vpn service control signaling and transport tunnel mapping do not match. Its symptom is The provider MVPN receives control routes but does not deliver customer stream data. For this case the actual issue is source-specific join signaling requires igmpv3 or supported source filters, and the relevant success signal is The receiver establishes an (S,G) state for the intended channel.
This result is useful in another case with evidence Packets are dropped by reverse-path-forwarding checks. It does not test recovery from the route never appears despite an active local igmpv2 membership. Check instead whether the receiver establishes an (S,G) state for the intended channel.