Siemens S223 - Manual (Page 283)

User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 283
9.2 Internet 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.
9.2.1 IGMP Basic Configuration
This chapter explains how to configure basic IGMP features such as IGMP version, IGMP
DB and Debugging method.
9.2.1.1 IGMP 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
ip igmp version <1-3>
Selects an IGMP version.
1: version 1
2: version 2
3: version 3 (default)
no ip igmp version
Interface
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