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Catalyst 3750 Switch Command Reference
OL-8552-07
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
mvr (global configuration)
Command Modes Global configuration
Command History
Usage Guidelines A maximum of 256 MVR multicast groups can be configured on a switch.
Use the mvr group command to statically set up all the IP multicast addresses that will take part in
MVR. Any multicast data sent to a configured multicast address is sent to all the source ports on the
switch and to all receiver ports that have registered to receive data on that IP multicast address.
MVR supports aliased IP multicast addresses on the switch. However, if the switch is interoperating with
Catalyst 3550 or Catalyst 3500 XL switches, you should not configure IP addresses that alias between
themselves or with the reserved IP multicast addresses (in the range
224.0.0.xxx).
The mvr querytime command applies only to receiver ports.
If the switch MVR is interoperating with Catalyst 2900 XL or Catalyst 3500 XL switches, set the
multicast mode to compatible.
When operating in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.
MVR can coexist with IGMP snooping on a switch.
Multicast routing and MVR cannot coexist on a switch. If you enable multicast routing and a multicast
routing protocol while MVR is enabled, MVR is disabled and a warning message appears. If you try to
enable MVR while multicast routing and a multicast routing protocol are enabled, the operation to
enable MVR is cancelled with an Error message.
Examples This example shows how to enable MVR:
Switch(config)# mvr
Use the show mvr privileged EXEC command to display the current setting for maximum multicast
groups.
This example shows how to configure 228.1.23.4 as an IP multicast address:
Switch(config)# mvr group 228.1.23.4
This example shows how to configure ten contiguous IP multicast groups with multicast addresses from
228.1.23.1 to 228.1.23.10:
Switch(config)# mvr group 228.1.23.1 10
Use the show mvr members privileged EXEC command to display the IP multicast group addresses
configured on the switch.
This example shows how to set the maximum query response time as one second (10 tenths):
Switch(config)# mvr querytime 10
This example shows how to set VLAN 2 as the multicast VLAN:
Switch(config)# mvr vlan 2
You can verify your settings by entering the show mvr privileged EXEC command.
Release Modification
12.1(11)AX This command was introduced.
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