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This is the multicast use case for DIRECTV streaming video delivery network Phase 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 Legacy L3 multicast and unicast routing protocols namely ISIS & PIM-SSM and IS-IS respectively.
Incremental Deployment
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