Configuring Igmp Snooping; Information About Igmp Snooping - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Configuring IGMP Snooping

Internet Group Management Protocol (IGMP) snooping streamlines multicast traffic handling for VLANs.
By examining (snooping) IGMP membership report messages from interested hosts, multicast traffic is
limited to the subset of VLAN interfaces on which the hosts reside.
This chapter describes the configuration of IGMP snooping on Cisco Nexus 5000 Series switches. It includes
the following sections:
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Information About IGMP Snooping

The IGMP snooping software examines IGMP protocol messages within a VLAN to discover which interfaces
are connected to hosts or other devices interested in receiving this traffic. Using the interface information,
IGMP snooping can reduce bandwidth consumption in a multi-access LAN environment to avoid flooding
the entire VLAN. The IGMP snooping feature tracks which ports are attached to multicast-capable routers to
help it manage the forwarding of IGMP membership reports. The IGMP snooping software responds to
topology change notifications.
IGMP snooping is supported on all Ethernet interfaces. The term snooping is used because Layer 3 control
Note
plane packets are intercepted and influence Layer 2 forwarding decisions.
Cisco NX-OS supports IGMPv2 and IGMPv3. IGMPv2 supports IGMPv1, and IGMPv3 supports IGMPv2.
Although not all features of an earlier version of IGMP are supported, the features related to membership
query and membership report messages are supported for all IGMP versions.
OL-16597-01
Information About IGMP Snooping, page 215
Configuring IGMP Snooping Parameters, page 218
Verifying IGMP Snooping Configuration, page 220
C H A P T E R
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
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