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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
660
multicast group. (Range: 224.0.1.0 -239.255.255.255)
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.
• 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. However, if a receiver port
is statically configured as a member of an MVR VLAN, its status will be inactive. Also, note that VLAN membership for
MVR receiver ports cannot be set to trunk mode (see the switchport mode command).
• 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). Note that only IGMP version 2 or 3 hosts can issue multicast join or leave messages.
Example
The following configures one source port and several receiver ports on the switch, enables immediate leave on one of the
receiver ports, and statically assigns a multicast group to another receiver port: