Avaya 8800 Planning And Engineering page 209

Figure 95: Static-RP in SMLT using the same CLIP address
In the preceding figure, the multicast traffic flows as follows:
1. The multicast server sends multicast data towards the Source DR (SDR) SW_A.
2. The SDR sends register messages with encapsulated multicast data towards the
3. Once the client sends IGMP membership reports towards the multicast router, the
4. The RP sends joins towards the source on the reverse path.
5. When the SDR receives the joins, it sends native multicast traffic.
6. When SW_B or SW_D receive multicast traffic from upstream, they forward the
7. In the case of SW_D (RP) failure, SW_B changes only the next-hop interface
Planning and Engineering — Network Design
RP.
multicast router creates a (*,G) entry
traffic on the IST as well as on the SMLT link. However, on the other aggregation
switches (SW_C and SW_E) multicast traffic is dropped at the egress side. (This is
in accordance with the SMLT/RSMLT design to provide fast failover for multicast
traffic.) Both aggregation switches SW_D and SW_E have similar (S,G) records.
towards SW_E, and since the RP address is the same, it does not flush any (S,G)
entries. In this way, this configuration achieves faster failover.
Multicast and SMLT guidelines
November 2010 209