Igmp Version Differences - Cisco Catalyst 3650 Configuration Manual

IGMP Versions
• An IGMPv3 device can receive messages from and forward messages to a device running the Source
Specific Multicast (SSM) feature.

IGMP Version Differences

There are three versions of IGMP, as defined by Request for Comments (RFC) documents of the Internet
Engineering Task Force (IETF). IGMPv2 improves over IGMPv1 by adding the ability for a host to signal
desire to leave a multicast group and IGMPv3 improves over IGMPv2 mainly by adding the ability to listen
to multicast originating from a set of source IP addresses only.
Table 4: IGMP Versions
IGMP Version
IGMPv1
IGMPv2
IGMPv3
By default, enabling a PIM on an interface enables IGMPv2 on that device. IGMPv2 was designed to be
Note
as backward compatible with IGMPv1 as possible. To accomplish this backward compatibility, RFC 2236
defined special interoperability rules. If your network contains legacy IGMPv1 hosts, you should be
familiar with these operability rules. For more information about IGMPv1 and IGMPv2 interoperability,
see RFC 2236, Internet Group Management Protocol, Version 2 .
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
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Description
Provides the basic query-response mechanism that
allows the multicast device to determine which
multicast groups are active and other processes that
enable hosts to join and leave a multicast group. RFC
1112 defines the IGMPv1 host extensions for IP
multicasting.
Extends IGMP, allowing such capabilities as the
IGMP leave process, group-specific queries, and an
explicit maximum response time field. IGMPv2 also
adds the capability for devices to elect the IGMP
querier without dependence on the multicast protocol
to perform this task. RFC 2236 defines IGMPv2.
Provides for source filtering, which enables a
multicast receiver host to signal to a device which
groups it wants to receive multicast traffic from, and
from which sources this traffic is expected. In
addition, IGMPv3 supports the link local address
224.0.0.22, which is the destination IP address for
IGMPv3 membership reports; all IGMPv3-capable
multicast devices must listen to this address. RFC
3376 defines IGMPv3.
Configuring IGMP
OL-29890-01