LevelOne FGL-2870 - Manual (Page 348)

Configuring the Switch
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Configuring MVR Interface Status
Each interface that participates in the MVR VLAN must be configured as an MVR
source port or receiver port. If only one subscriber attached to an interface is
receiving multicast services, you can enable the immediate leave function.
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 an MVR VLAN. Multicast groups
can also be statically assigned to a receiver port (see "Assigning Static Multicast
Groups to Interfaces" on page 3-296). However, if a receiver port is statically
configured as a member of an MVR VLAN, its MVR status will be inactive. Also,
note that VLAN membership for MVR receiver ports cannot be set to trunk mode
(see "Configuring VLAN Behavior for Interfaces" on page 3-217).
• 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 (see "Assigning Static
Multicast Groups to Interfaces" on page 3-296).
• 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.
Command Attributes
• MVR Type – The following interface types are supported:
- Source – An uplink port that can send and receive multicast data for the groups
assigned to the MVR VLAN. Note that the source port must be manually
configured as a member of the MVR VLAN (see "Adding Static Members to
VLANs (VLAN Index)" on page 3-214).
- Receiver – A subscriber port that can receive multicast data sent through the
MVR VLAN. Any port configured as an receiver port will be dynamically added
to the MVR VLAN when it forwards an IGMP report or join message from an
attached host requesting any of the designated multicast services supported by
the MVR VLAN.