Configuring Mvr; Default Mvr Configuration - Cisco 2950G 24 - Catalyst Switch Software Configuration Manual

Chapter 17 Configuring IGMP Snooping and MVR
MVR eliminates the need to duplicate television-channel multicast traffic for subscribers in each VLAN.
Multicast traffic for all channels is only sent around the VLAN trunk once—only on the multicast
VLAN. Although the IGMP leave and join message in the VLAN to which the subscriber port is
assigned. These messages dynamically register for streams of multicast traffic in the multicast VLAN
on the Layer 3 device. The access layer switch (S1 switch) modifies the forwarding behavior to allow
the traffic to be forwarded from the multicast VLAN to the subscriber port in a different VLAN,
selectively allowing traffic to cross between two VLANs.
IGMP reports are sent to the same MAC addresses as the multicast data. The S1 CPU must capture all
IGMP join and leave messages from receiver ports and forward them to the multicast VLAN of the
source (uplink) port.

Configuring MVR

These sections include basic MVR configuration information:
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Default MVR Configuration

Table 17-5
Table 17-5 Default MVR Configuration
Feature
MVR
Multicast addresses
Query response time
Multicast VLAN
Mode
Interface (per port) default
Immediate Leave
78-14982-01
Default MVR Configuration, page 17-15
MVR Configuration Guidelines and Limitations, page 17-16
Configuring MVR Global Parameters, page 17-16
Configuring MVR Interfaces, page 17-17
shows the default MVR configuration.
Default Setting
Disabled globally and per interface
None configured
0.5 second
VLAN 1
Compatible
Neither a receiver nor a source port
Disabled on all ports
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring MVR
17-15