Cisco Catalyst 2950 Command Reference Manual page 254

mvr
Command Modes Global configuration
Command History Release
12.1(6)EA2
Usage Guidelines A maximum of 256 MVR multicast groups can be configured on a switch.
Use the mvr group command to statically configure 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 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 parameter applies only to receiver ports.
The mvr group and mvr vlan commands only apply to ports configured as receiver ports.
If the switch MVR is interoperating with Catalyst 2900 XL or Catalyst 3500 XL switches, set the
multicast mode to compatible.
When in compatible mode, MVR does not support IGMP dynamic joins on MVR source ports.
Examples This example shows how to enable MVR:
Switch(config)# mvr
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
This example shows how to set the maximum query response time as 1 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
Catalyst 2950 and Catalyst 2955 Switch Command Reference
2-224
Modification
This command was introduced.
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
OL-10102-01