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16-17
Catalyst 2940 Switch Software Configuration Guide
78-15507-02
Chapter 16 Configuring IGMP Snooping and MVR
Configuring MVR
MVR Configuration Guidelines and Limitations
Follow these guidelines when configuring MVR:
• Receiver ports cannot be trunk ports. Receiver ports on a switch can be in different VLANs, but
should not belong to the multicast VLAN.
• The maximum number of multicast entries that can be configured on a switch (that is, the maximum
number of television channels that can be received) is 256.
• Each channel is one multicast stream destined for a unique IP multicast address. These IP addresses
cannot alias between themselves or with the reserved IP multicast addresses (in the
range 224.0.0.xxx).
• MVR does not support IGMPv3 messages.
Note For complete syntax and usage information for the commands used in this section, refer to the command
reference for this release.
Configuring MVR Global Parameters
You do not need to set the optional MVR parameters if you choose to use the default settings. If you do
want to change the default parameters (except for the MVR VLAN), you must first enable MVR.
Beginning in privileged EXEC mode, follow these steps to configure MVR parameters:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mvr Enable MVR on the switch.
Step 3
mvr group ip-address [count] Configure an IP multicast address on the switch or use the count parameter to
configure a contiguous series of MVR group addresses (the range for count is
1 to 256; the default is 1). Any multicast data sent to this address is sent to all
source ports on the switch and all receiver ports that have elected to receive
data on that multicast address. Each multicast address would correspond to
one television channel.
Note Each IP address translates to a multicast 48-bit MAC address. If an IP
address being configured translates (aliases) to a previously
configured MAC address or to any reserved multicast MAC addresses,
the command fails.
Step 4
mvr querytime value (Optional) Define the maximum time to wait for IGMP report memberships
on a receiver port before removing the port from multicast group membership.
The value is in units of tenths of a second. The range is from 1 to 100 and the
default is 5 tenths or one-half second.
Step 5
mvr vlan vlan-id (Optional) Specify the VLAN in which multicast data is received; all source
ports must belong to this VLAN. The VLAN range is 1 to 1005.
The default is VLAN 1.