Chapter 20
| 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
◆ 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
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