|BIER -- "Bit Indexed Explicit Replication discussion list"
There is a need to simplify network operations for multicast services. Current solutions require a tree-building control plane, which maintains end-to-end tree state per flow, impacting router state capacity and network convergence times. Multi-point tree building protocols are often considered complex to deploy and debug and include mechanics from legacy use-cases and/or assumptions which may no longer apply to the current deployments. When multicast services are transiting a provider network through an overlay, the core network has a choice to either aggregate customer state into a minimum set of core states resulting in flooding traffic to unwanted network end-points, or to map per-customer, per-flow tree state directly into the provider core state amplifying the network-wide state problem.
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