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We present Elmo, a system that addresses the multicast scalability problem inmulti-tenant data centers. Modern cloud applications frequently exhibitone-to-many communication patterns and, at the same time, requiresub-millisecond latencies and high throughput. IP multicast can achieve theserequirements but has control- and data-plane scalability limitations that makeit challenging to offer it as a service for hundreds of thousands of tenants,typical of cloud environments. Tenants, therefore, must rely on unicast-basedapproaches (e.g., application-layer or overlay-based) to support multicast intheir applications, imposing overhead on throughput and end host CPUutilization, with higher and unpredictable latencies.  Elmo scales network multicast by taking advantage of emerging programmableswitches and the unique characteristics of data-center networks; specifically,the symmetric topology and short paths in a data center. Elmo encodes multicastgroup information inside packets themselves, reducing the need to store thesame information in network switches. In a three-tier data-center topology with27K hosts, Elmo supports a million multicast groups using a 325-byte packetheader, requiring as few as 1.1K multicast group-table entries on average inleaf switches, with a traffic overhead as low as 5% over ideal multicast.

Elmo: Source-Routed Multicast for Cloud Services