Current implementations involving Broadcast, Unknown-Unicast & Multicast (BUM) traffic in a Software-Defined Access (SDA) fabric typically rely on a traditional multicast model in which each Fabric-Edge device joins a shared Internet Protocol (IP) multicast-group having a pre-defined Multicast Rendezvous Point (RP) node or nodes— effectively establishing one large broadcast domain for all Layer 2 (L2) instances in the fabric. Techniques presented herein provide for the ability to establish a model for assigning shared groups of Virtual Extensible Local Area Network (VxLAN) Virtual Network Instances (VNIs) logically and programmatically on a Fabric-Edge device to a dedicated Bit Index Explicit Replication (BIER) SubDomain based on the provisioning characteristics of the fabric. This will allow the fabric to leverage the benefits of the BIER forwarding plane in order to improve forwarding performance, achieve scalable partitioning of the BUM domains, and reduce control-plane complexity.
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Neogi, Denis, "TECHNIQUES TO OPTIMIZE SOFTWARE-DEFINED ACCESS LAYER 2 BROADCAST, UNKNOWN-UNICAST AND MULTICAST (BUM) USE-CASES WITH BIT INDEX EXPLICIT REPLICATION (BIER)", Technical Disclosure Commons, (January 27, 2022)