Installation manual

4-334
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• 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 4-314). 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, statically assigns a multicast group
to a receiver port using the MVR VLAN, and then statically assigns an MVR receiver
group to the MVR receiver VLAN:
Console(config)#interface ethernet 1/5
Console(config-if)#mvr type source
Console(config-if)#exit
Console(config)#interface ethernet 1/6
Console(config-if)#mvr type receiver
Console(config-if)#mvr immediate
Console(config-if)#exit
Console(config)#interface ethernet 1/7
Console(config-if)#mvr type receiver
Console(config-if)#mvr group 225.0.0.5
Console(config-if)#exit
Console(config)#interface ethernet 1/8
Console(config-if)#mvr type receiver
Console(config-if)#mvr static-reciever-group 225.0.0.6
Console(config-if)#