Cisco Systems 3130 User Manual
23-19
Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter 23 Configuring IGMP Snooping and MVR
Understanding Multicast VLAN Registration
Using MVR in a Multicast Television Application
In a multicast television application, a server connected to a blade switch can receive the multicast
stream. Multiple devices can be connected to one subscriber port, which is a switch port configured as
an MVR receiver port.
stream. Multiple devices can be connected to one subscriber port, which is a switch port configured as
an MVR receiver port.
is an example configuration. DHCP assigns an IP address to the
server. When a subscriber on the server selects a channel, the server sends an IGMP report to the blade
switch to join the appropriate multicast. If the IGMP report matches one of the configured IP multicast
group addresses, the switch CPU modifies the hardware address table to include this receiver port and
VLAN as a forwarding destination of the specified multicast stream when it is received from the
multicast VLAN. Uplink ports that send and receive multicast data to and from the multicast VLAN are
called MVR source ports.
switch to join the appropriate multicast. If the IGMP report matches one of the configured IP multicast
group addresses, the switch CPU modifies the hardware address table to include this receiver port and
VLAN as a forwarding destination of the specified multicast stream when it is received from the
multicast VLAN. Uplink ports that send and receive multicast data to and from the multicast VLAN are
called MVR source ports.
Figure 23-3
Multicast VLAN Registration Example
When the subscriber changes channels or stops the multicast stream, the server sends an IGMP leave
message for the multicast stream. The switch CPU sends a MAC-based general query through the
receiver port VLAN. If there is another device in the VLAN still subscribing to this group, that device
must respond within the maximum response time specified in the query. If the CPU does not receive a
response, it eliminates the receiver ports as a forwarding destination for this group.
message for the multicast stream. The switch CPU sends a MAC-based general query through the
receiver port VLAN. If there is another device in the VLAN still subscribing to this group, that device
must respond within the maximum response time specified in the query. If the CPU does not receive a
response, it eliminates the receiver ports as a forwarding destination for this group.
Without Immediate Leave, when the switch receives an IGMP leave message from a subscriber on a
receiver port, it sends out an IGMP query on that port and waits for IGMP group membership reports. If
no reports are received in a configured time period, the receiver port is removed from multicast group
membership. With Immediate Leave, an IGMP query is not sent from the receiver port on which the
receiver port, it sends out an IGMP query on that port and waits for IGMP group membership reports. If
no reports are received in a configured time period, the receiver port is removed from multicast group
membership. With Immediate Leave, an IGMP query is not sent from the receiver port on which the
Multicast VLAN
SP
SP
SP
SP
RP1
RP2
RP3
RP4
RP5
RP = Receiver Port
SP = Source Port
SP = Source Port
Note: All source ports belong to
the
the
multicast
VLAN.
SP
Cisco router
Multicast
server
Server
Switch
Blade Switch
Switch
Switch
201915
Server
Server
Server
Server