Avaya 8800 Planning And Engineering, Network Design page 231

Figure 113: 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 RP.
3. Once the client sends IGMP membership reports towards the multicast router, the multicast
router creates a (*,G) entry
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 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.
7. If the SW_D (RP) fails, SW_B changes only the next-hop interface 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.
June 2016 Planning and Engineering — Network Design
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Multicast and SMLT guidelines
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