SMC Networks SMC Tiger 10/100 SMC6128L2 - Manual (Page 554)

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MVR VLAN. Multicast groups can also be statically assigned to a
receiver port using the group keyword.
• One or more interfaces may be configured as MVR source ports. A
source port is able to both receive and send data for multicast groups
which it has joined through IGMP snooping or which have been
statically assigned using the group keyword.
• The IP address range from 224.0.0.0 to 239.255.255.255 is used for
multicast streams. MVR group addresses cannot fall within the
reserved IP multicast address range of 224.0.0.x.
• Immediate leave applies only to receiver ports. When enabled, the
receiver port is immediately removed from the multicast group
identified in the leave message. When immediate leave is disabled, the
switch follows the standard rules by sending a group-specific query to
the receiver port and waiting for a response to determine if there are
any remaining subscribers for that multicast group before removing
the port from the group list.
• Using immediate leave can speed up leave latency, but should only be
enabled on a port attached to one multicast subscriber to avoid
disrupting services to other group members attached to the same
interface.
• Immediate leave does not apply to multicast groups which have been
statically assigned to a port.
• IGMP snooping must be enabled to a allow a subscriber to
dynamically join or leave an MVR group (see ip igmp snooping on
page 4-230). Note that only IGMP version 2 or 3 hosts can issue
multicast join or leave messages.