Siemens S223 Internet Group Management Protocol Igmp, Igmp Basic Configuration, Igmp Version

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

9.2Internet Group Management Protocol (IGMP)

Internet Group Management Protocol (IGMP) is used by hosts and routers that support multicasting. All the systems on a network can know which hosts belong to which multi- cast groups. IGMP is not multicast routing protocol but group management protocol.

Multicast routers can receive thousands of multicast packets from other group. If a router does not have the information of host membership, it has to broadcast the packets. This is bandwidth waste. To solve this problem, one group list of members is maintained. IGMP helps multicast router to create and renew the list.

The hiD 6615 S223/S323 supports IGMP Version 1, 2 and 3.

9.2.1IGMP Basic Configuration

This chapter explains how to configure basic IGMP features such as IGMP version, IGMP DB and Debugging method.

9.2.1.1IGMP Version per Interface

You can configure the IGMP Protocol version on an interface. To configure the IGMP Pro- tocol version, use the following command.

Command	Mode	Description
		Selects an IGMP version.
ip igmp version <1-3>		1: version 1
	Interface	2: version 2
		3: version 3 (default)
no ip igmp version		Returns to the default setting. (version 3)

•IGMP Version 1

Provides basic Query-Response mechanism that allows the multicast router to deter- mine which multicast groups are active an other processes that enable hosts to join and leave a multicast group.

•IGMP Version 2

Extends IGMP features as IGMP leave process, group-specific queries and explicit maximum query response time. It added support for "low leave latency", that is, a reduction in the time it takes for a multicast router to learn that there are no longer any members of a particular group present on an attached network.

•IGMP Version 3

Version 3 of IGMP adds support for "source filtering", that is, the ability for a system to report interest in receiving packets ‘only’ from specific source addresses, or from ‘all but’ specific source addresses, sent to a particular multicast address. That infor- mation may be used by multicast routing protocols to avoid delivering multicast pack- ets from specific sources to networks where there are no interested receivers

A50010-Y3-C150-2-7619 283