C
HAPTER
39
| Multicast Filtering Commands
IGMP Proxy Routing
– 948 –
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)#
ip igmp proxy
unsolicited-report-
interval
This command specifies how often the upstream interface should transmit
unsolicited IGMP reports. Use the no form to restore the default value.
SYNTAX
ip igmp proxy unsolicited-report-interval seconds
no ip igmp proxy unsolicited-report-interval
seconds - The interval at which to issue unsolicited reports.
(Range: 1-65535 seconds)
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