14-17
Cisco Systems IntelligentGigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
24R9746
Chapter14 Configuring IGMP Snooping and MVR
Configuring MVR
Figure14-3 Multicast VLAN Registration Example
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 (Switch A) modifies the forwarding behavior t o 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 Switch A 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 MVRThese sections include basic MVR configuration information:
•Default MVR Configuration, page 14-18
•MVR Configuration Guidelines and Limitations, page 14-18
•Configuring MVR Global Parameters, page 14-18
•Configuring MVR Interfaces, page 14-20
SP1
Multicast
data Multicast
data
Multicast VLAN
SP
SP
RP = Receiver Port
SP = Source Port
Note: All source ports belong to
the multicast VLAN.
SP
SP
SP
SP
Cisco router
Multicast
server
Catalyst 3550 switch
Catalyst 2950
or 2955
switch
Catalyst 2950
or 2955
switch
SP2
92427
BladeCenter
Server (RP1)
Server (RP2)