Configuring Igmp; Information About Igmp; Igmp Versions - Cisco Nexus 7000 Series Configuration Manual

Configuring IGMP

This chapter describes how to configure the Internet Group Management Protocol (IGMP) on Cisco NX-OS
devices for IPv4 networks.
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Information About IGMP

IGMP is an IPv4 protocol that a host uses to request multicast data for a particular group. Using the information
obtained through IGMP, the software maintains a list of multicast group or channel memberships on a
per-interface basis. The systems that receive these IGMP packets send multicast data that they receive for
requested groups or channels out the network segment of the known receivers.
By default, the IGMP process is running. You cannot enable IGMP manually on an interface. IGMP is
automatically enabled when you perform one of the following configuration tasks on an interface:
• Enable PIM
• Statically bind a local multicast group
• Enable link-local group reports

IGMP Versions

The device supports IGMPv2 and IGMPv3, as well as IGMPv1 report reception.
By default, the software enables IGMPv2 when it starts the IGMP process. You can enable IGMPv3 on
interfaces where you want its capabilities.
IGMPv3 includes the following key changes from IGMPv2:
• Support for Source-Specific Multicast (SSM), which builds shortest path trees from each receiver to the
Information About IGMP, on page 17
Licensing Requirements for IGMP, on page 21
Prerequisites for IGMP, on page 21
Default Settings for IGMP, on page 22
Configuring IGMP Parameters, on page 22
source, through the following features:
• Host messages that can specify both the group and the source.
C H A P T E R
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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