•
In compatible mode, multicast data received by MVR hosts is forwarded to all MVR data ports, regardless
of MVR host membership on those ports. The multicast data is forwarded only to those receiver ports
that MVR hosts have joined, either by IGMP reports or by MVR static configuration. IGMP reports
received from MVR hosts are never forwarded from MVR data ports that were configured in the switch.
•
In dynamic mode, multicast data received by MVR hosts on the switch is forwarded from only those
MVR data and client ports that the MVR hosts have joined, either by IGMP reports or by MVR static
configuration. Any IGMP reports received from MVR hosts are also forwarded from all the MVR data
ports in the host. This eliminates using unnecessary bandwidth on MVR data port links, which occurs
when the switch runs in compatible mode.
MVR and Switch Stacks
Only one MVR multicast VLAN per switch or switch stack is supported.
Receiver ports and source ports can be on different switches in a switch stack. Multicast data sent on the
multicast VLAN is forwarded to all MVR receiver ports across the stack. When a new switch is added to a
stack, by default it has no receiver ports.
If a switch fails or is removed from the stack, only those receiver ports belonging to that switch will not receive
the multicast data. All other receiver ports on other switches continue to receive the multicast data.
MVR in a Multicast Television Application
In a multicast television application, a PC or a television with a set-top box can receive the multicast stream.
Multiple set-top boxes or PCs can be connected to one subscriber port, which is a switch port configured as
an MVR receiver port.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
124
Information About IGMP Snooping and MVR
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