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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to Multicast VLAN Replication

Introduction to Multicast VLAN Replication

This section describes the definition and purposes of multicast VLAN replication.


The multicast VLAN replication is used to replicate and distribute the same multicast data to different user VLANs.


On a Layer 2 broadcast network, multicast data is broadcast to all hosts. The IGMP snooping function solves this problem. This function, however, takes effect based on a VLAN. If users in different VLANs require the same multicast data, the upstream router still has to send multiple copies of identical multicast data to different VLANs.

The multicast VLAN replication can be configured on the Layer 2 device to implement inter-VLAN multicast replication. after the multicast VLAN replication is configured on the Layer 2 device, the upstream router replicates multicast data in the multicast VLAN and sends only one copy to the Layer 2 device. the upstream router no longer needs to send several identical multicast data flows downstream. This saves network bandwidth and reduces the burden on the router.

Updated: 2019-08-09

Document ID: EDOC1000041694

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