Configuring Mvr; Default Mvr Configuration; Mvr Configuration Guidelines And Limitations - Cisco Catalyst 2960 Software Configuration Manual

Configuring MVR

These messages dynamically register for streams of multicast traffic in the multicast VLAN on the
Layer 3 device. Switch B. The access layer switch, Switch A, 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 IP multicast group address 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, based on the MVR mode.
Configuring MVR
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Default MVR Configuration

Table 21-5
Feature
MVR
Multicast addresses
Query response time
Multicast VLAN
Mode
Interface (per port) default
Immediate Leave

MVR Configuration Guidelines and Limitations

Follow these guidelines when configuring MVR:
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Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
21-20
Default MVR Configuration, page 21-20
MVR Configuration Guidelines and Limitations, page 21-20
Configuring MVR Global Parameters, page 21-21
Configuring MVR Interfaces, page 21-22
Default MVR Configuration
Receiver ports can only be access ports; they 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 (MVR group addresses) that can be configured on a
switch (that is, the maximum number of television channels that can be received) is 256.
MVR multicast data received in the source VLAN and leaving from receiver ports has its
time-to-live (TTL) decremented by 1 in the switch.
Because MVR on the switch uses IP multicast addresses instead of MAC multicast addresses,
aliased IP multicast addresses are allowed on the switch. However, if the switch is interoperating
with Catalyst 3550 or Catalyst 3500 XL switches, you should not configure IP addresses that alias
between themselves or with the reserved IP multicast addresses (in the range 224.0.0.xxx).
MVR can coexist with IGMP snooping on a switch.
Chapter 21
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
Configuring IGMP Snooping and MVR
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