CLI Reference Guide-R07

Chapter 23 | Multicast Filtering Commands
IGMP Snooping
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Command Mode
Global Configuration
Command Usage
◆ 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 last leave, and query suppression. 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)#
ip igmp snooping
querier
This command enables the switch as an IGMP querier. Use the no form to disable it.
Syntax
[no] ip igmp snooping querier
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
If enabled, the switch will serve as querier if elected. The querier is responsible for
asking hosts if they want to receive multicast traffic.
Example
Console(config)#ip igmp snooping querier
Console(config)#
ip igmp snooping
router-alert-option-
check
This command discards any IGMPv2/v3 packets that do not include the Router
Alert option. Use the no form to ignore the Router Alert Option when receiving
IGMP messages.
Syntax
[no] ip igmp snooping router-alert-option-check