Siemens S223, S323 user manual Igmp v3 Snooping, Igmp Snooping Version, Join Host Management

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

9.2.6IGMP v3 Snooping

This chapter consists of these sections

•IGMP Snooping Version

•Join Host Management

•Immediate Block

9.2.6.1IGMP Snooping Version

The reports sent to the multicast router are sent based on the version of that interface. A user can administratively configure the version of the port as 1 or 2. If the user has con- figured the version specifically, the reports are always sent out with only this version. If the user has not administratively configured the version value, and a v1 query is received on an interface, this interface is made a v1 interface, and all reports sent out of this inter- face are v1 reports. If no v1 query is received on an interface for the v1 router present timeout period (400 seconds), the interface version goes back to its default value (2).

To configure the version of the IGMP reports sent out of a port, use the following com- mand.

Command	Mode	Description
ip igmp snooping version <1-3>		Configures the version of IGMP report on the system.
		1-3: IGMP report version
	Global
ip igmp snooping vlan VLANS		Configures the version of IGMP report on a VLAN inter-
version <1-3>		face.

To return to the default version of IGMP report, use the no parameter command.

9.2.6.2Join Host Management

Explicit host tracking is supported only with IGMP v3 hosts.

With explicit host tracking enabled, the switch is in its proxy-reporting mode. In proxy- reporting mode, the switch forwards the first report only for a source-multicast group pair to the router, and suppresses all other reports for the same pair. With IGMP v3 proxy re- porting, the switch does proxy reporting for unsolicited reports and reports that are re- ceived in the general query interval. By enabling explicit tracking, the router might not be able to track all the hosts that are behind a VLAN interface.

With proxy reporting disabled, the switch works in transparent mode, and updates the IGMP snooping database as it receives reports, then forwards this information to the up- stream router. The router can then explicitly track all reporting hosts.

To enable explicit host tracking on a VLAN, use the following command.

Command		Mode	Description
ip igmp snooping	explicit-		Enables explicit host tracking on the system.
tracking
		Global
ip igmp snooping vlan	VLANS		Enables explicit host tracking on a VLAN interface.
explicit-tracking

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