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ISCOM2600G-HI (A) Series Configuration Guide
After multicast VLAN copy is enabled, the upper layer device copies multicast data in the
multicast VLAN, instead of copying multicast data for each user VLAN, thus saving
bandwidth. The system searches for the egress interface according to the multicast VLAN and
multicast group address, and copies multicast data for each user VLAN on the egress interface.
Both multicast VLAN copy and IGMP MVR can implement multicast functions when user
VLANs and the multicast VLAN are in different VLANs. Their difference is that multicast
data of IGMP MVR can be forwarded in a multicast VLAN but multicast VLAN copy is used
to copy multicast data to each user VLAN.
IGMP MVR transmits data in a way as shown in Figure 8-11 while multicast VLAN copy
transmits data in a way as shown in Figure 8-12.
Figure 8-11 Data transmission of IGMP MVR
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