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

Configuring IGMP Snooping

This chapter describes how to configure Internet Group Management Protocol (IGMP) snooping on a Cisco
NX-OS device.
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Information About IGMP Snooping

Note
We recommend that you do not disable IGMP snooping on the device. If you disable IGMP snooping, you
might see reduced multicast performance because of excessive false flooding within the device.
IGMP snooping software examines Layer 2 IP multicast traffic within a VLAN to discover the ports where
interested receivers reside. Using the port information, IGMP snooping can reduce bandwidth consumption
in a multiaccess LAN environment to avoid flooding the entire VLAN. IGMP snooping tracks which ports
are attached to multicast-capable routers to help the routers forward IGMP membership reports. The IGMP
snooping software responds to topology change notifications. By default, IGMP snooping is enabled on the
device.
This figure shows an IGMP snooping switch that sits between the host and the IGMP router. The IGMP
snooping switch snoops the IGMP membership reports and leave messages and forwards them only when
necessary to the connected IGMP routers.
Information About IGMP Snooping, on page 127
Licensing Requirements for IGMP Snooping, on page 131
Prerequisites for IGMP Snooping, on page 131
Guidelines and Limitations for IGMP Snooping, on page 131
Default Settings for IGMP Snooping, on page 132
Configuring IGMP Snooping Parameters, on page 133
Verifying IGMP Snooping Configuration, on page 153
Displaying IGMP Snooping Statistics, on page 153
Configuration Example for IGMP Snooping, on page 153
Related Documents, on page 154
Standards, on page 155
Feature History for IGMP Snooping in CLI, on page 155
C H A P T E R
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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