LevelOne FGL-2870 - Manual (Page 759)

Multicast Filtering Commands
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vlan command (page 4-303), but MVR receiver ports should not be statically
configured as members of this VLAN.
• IGMP snooping must be enabled to a allow a subscriber to dynamically join or
leave an MVR group (see ip igmp snooping on page 4-375). Note that only
IGMP version 2 or 3 hosts can issue multicast join or leave messages.
• IGMP snooping and MVR share a maximum number of 255 groups. Any
multicast streams received in excess of this limitation will be flooded to all
ports in the associated VLAN.
• Multicast traffic forwarded to subscribers is normally stripped of frame tags to
prevent the hosts from discovering the identity of the MVR VLAN. To allow
multicast traffic with tagged frames to be sent to subscribers without revealing
the identity of the MVR VLAN, both the receiver-group and receiver-vlan
attributes must be specifically defined. If a port is manually assigned to the
receiver VLAN as a tagged member, multicast traffic forwarded to the
subscriber will also carry tags.
Note that the receiver-group and group attributes cannot be configured with
the same addresses. Nor can the receiver-vlan and vlan attributes be
configured with the same VLAN.
Example
The following example enables MVR globally, and configures a range of MVR group
addresses:
Console(config)#mvr
Console(config)#mvr group 228.1.23.1 10
Console(config)#