Chapter 24
| Multicast Filtering Commands
IGMP Proxy Routing
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Command Mode
Interface Configuration (VLAN)
Command Usage
â—† When IGMP proxy is enabled on an interface, that interface is known as the
upstream or host interface. This interface performs only the host portion of
IGMP by sending IGMP membership reports, and automatically disables IGMP
router functions.
â—† Interfaces with IGMP enabled, but not located in the direction of the multicast
tree root are known as downstream or router interfaces. These interfaces
perform the standard IGMP router functions by maintaining a database of all
IGMP subscriptions on the downstream interface. IGMP must therefore be
enabled on all downstream interfaces which require proxy multicast service.
â—† When changes occur in the downstream IGMP groups, a IGMP state change
report is created and sent to the upstream router.
â—† If there is an IGMPv1 or IGMPv2 querier on the upstream network, then the
proxy device will act as an IGMPv1 or IGMPv2 host on the upstream interface
accordingly. Otherwise, it will act as an IGMPv3 host.
â—† Multicast routing protocols are not supported on interfaces where IGMP proxy
service is enabled.
â—† Only one upstream interface is supported on the system.
â—† A maximum of 1024 multicast streams are supported.
Example
The following example enables multicast routing globally on the switch, configures
VLAN 2 as a downstream interface, and then VLAN 1 as the upstream interface.
Console(config)#ip multicast-routing
Console(config)#interface vlan2
Console(config-if)#ip igmp
Console(config-if)#exit
Console(config)#interface vlan1
Console(config-if)#ip igmp proxy
Console(config-if)#
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