Cisco catalyst 3750 Command Reference Manual page 430
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mvr (interface configuration)
Usage Guidelines
Configure a port as a source port if that port should be able to both send and receive multicast data bound
for the configured multicast groups. Multicast data is received on all ports configured as source ports.
Receiver ports cannot be trunk ports. Receiver ports on a switch can be in different VLANs, but should
not belong to the multicast VLAN.
A port that is not taking part in MVR should not be configured as an MVR receiver port or a source port.
A non-MVR port is a normal switch port, able to send and receive multicast data with normal switch
behavior.
When Immediate Leave is enabled, a receiver port leaves a multicast group more quickly. Without
Immediate Leave, when the switch receives an IGMP leave message from a group on a receiver port, it
sends out an IGMP MAC-based query on that port and waits for IGMP group membership reports. If no
reports are received in a configured time period, the receiver port is removed from multicast group
membership. With Immediate Leave, an IGMP MAC-based query is not sent from the receiver port on
which the IGMP leave was received. As soon as the leave message is received, the receiver port is
removed from multicast group membership, which speeds up leave latency.
The Immediate Leave feature should be enabled only on receiver ports to which a single receiver device
is connected.
The mvr vlan group command statically configures ports to receive multicast traffic sent to the IP
multicast address. A port statically configured as a member of group remains a member of the group until
statically removed. In compatible mode, this command applies only to receiver ports; in dynamic mode,
it can also apply to source ports. Receiver ports can also dynamically join multicast groups by using
IGMP join messages.
When operating in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.
An MVR port cannot be a private-VLAN port.
Examples
This example shows how to configure a port as an MVR receiver port:
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# mvr type receiver
Use the show mvr interface privileged EXEC command to display configured receiver ports and source
ports.
This example shows how to enable Immediate Leave on a port:
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# mvr immediate
This example shows how to add a port on VLAN 1 as a static member of IP multicast group 228.1.23.4:
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# mvr vlan1 group 230.1.23.4
You can verify your settings by entering the show mvr members privileged EXEC command.
Catalyst 3750 Switch Command Reference
2-400
Chapter 2
Catalyst 3750 Switch Cisco IOS Commands
OL-8552-07
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