Mvr (Global Configuration) - Cisco Catalyst 3550 Command Reference Manual

mvr (global configuration)

Command Modes Global configuration
Command History Release
12.1(4)EA1
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.
The mvr group command prevents adding IP multicast addresses that cause address aliasing between
Note
MVR multicast groups or with the reserved IP multicast addresses (in the range 224.0.0.xx). Each IP
multicast address translates to a multicast 48-bit MAC address. If the IP address being configured
translates (aliases) to the same 48-bit MAC address as a previously configured IP multicast address or
the reserved MAC multicast addresses, the command fails.
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.
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
This example shows how to disable MVR:
Switch(config)# no 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 command fails because of address aliasing:
Switch(config)# mvr group 230.1.23.4
Cannot add this IP address - aliases with previously configured IP address 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
Catalyst 3550 Multilayer Switch Command Reference
2-266
Modification
This command was introduced.
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
OL-8566-02