CLI Reference Guide-R02

Chapter 23 | Multicast Filtering Commands
IGMP Snooping
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ip igmp snooping
proxy-reporting
This command enables IGMP Snooping with Proxy Reporting. Use the no form to
restore the default setting.
Syntax
[no] ip igmp snooping proxy-reporting
ip igmp snooping vlan vlan-id proxy-reporting {enable | disable}
no ip igmp snooping vlan vlan-id proxy-reporting
vlan-id - VLAN ID (Range: 1-4094)
enable - Enable on the specified VLAN.
disable - Disable on the specified VLAN.
Default Setting
Global: Disabled
VLAN: Based on global setting
Command Mode
Global Configuration
Command Usage
◆ When proxy reporting is enabled with this command, reports received from
downstream hosts are summarized and used to build internal membership
states. Proxy-reporting devices may use the all-zeros IP source address when
forwarding any summarized reports upstream. For this reason, IGMP
membership reports received by the snooping switch must not be rejected
because the source IP address is set to 0.0.0.0.
◆ When proxy reporting is enabled with this command, the switch performs
“IGMP Snooping with Proxy Reporting” (as defined in DSL Forum TR-101, April
2006), including report suppression, last leave, and query suppression. Report
suppression intercepts, absorbs and summarizes IGMP reports coming from
downstream hosts. Last leave sends out a proxy query when the last member
leaves a multicast group, and query suppression means that specific queries
are not forwarded from an upstream multicast router to hosts downstream
from this device.
◆ If the IGMP proxy reporting is configured on a VLAN, this setting takes
precedence over the global configuration.
Example
Console(config)#ip igmp snooping proxy-reporting
Console(config)#