Cisco ASR 9000 Series

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As the same traffic stream comes in from both the hosts, the satellites pick a designated multicast
forwarder at discovery and continue to replicate from that host until that host goes away or loses its core
connectivity. Thus the offload topology is a full active / active system.
Figure 17: IGMP Join Programming (Access L2 and Core L2/BVI)
Figure 18: Multicast Offload Data Flow
Cisco ASR 9000 Series Aggregation Services Router nV System Configuration Guide, Release 5.3.x
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Configuring Multicast Offload on the Satellite nV System
Overview of Multicast Offload