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This is the multicast use case for DIRECTV streaming video delivery network Phase -1.1. SDN will be incrementally phased into the DIRECTV video distribution network, as I suspect will be the case for many large production networks. We will briefly look at the phases of deployment further down in this document.
The Network
The network topology can be viewed as a core network with two types of edges, the sending edge where video streams are encoded into IP packets and injected into the network, the recieving edge is where the video streams are decoded to be eventually delivered to the consumer. The core connects the sending and receiving edges. (This is somewhat over simplified but should suffice for this use case).
The network currently runs legacy unicast and multicast routing protocols namely ISIS & PIM-SSM.
Incremental Deployment
The plan at the moment of this writing is roughly:
- Phase 1: SDN Multicast at sender edge
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- Phase 2: SDN Multicast at receiving edge
- Phase 3+: Consider SDN in the core
This being the case, we will portions of the network running SDN with adjacent sections running legacy L3 routing protocols. Where niether section knows what the other section is doing.
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