SMC Networks SMC Tiger 10/100 SMC6128PL2 - Manual (Page 618)

Command Line Interface
4-310
4
Default Setting
• The port type is not defined.
• Immediate leave is disabled.
• No receiver port is a member of any configured multicast group.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• A port which is not configured as an MVR receiver or source port can use
IGMP snooping to join or leave multicast groups using the standard rules for
multicast filtering.
• MVR receiver ports cannot be members of a trunk. Receiver ports can belong
to different VLANs, but should not be configured as a member of the MVR
VLAN. IGMP snooping can be used to allow a receiver port to dynamically join
or leave multicast groups within the 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 allow a subscriber to dynamically join or
leave an MVR group (see ip igmp snooping on page 4-292). Note that only
IGMP version 2 or 3 hosts can issue multicast join or leave messages.