Cisco Systems N3KC3064TFAL3 Manual De Usuario
C H A P T E R
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Configuring IGMP Snooping
This chapter contains 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.
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
plane packets are intercepted and influence Layer 2 forwarding decisions.
plane packets are intercepted and influence Layer 2 forwarding decisions.
Note
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.
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.
Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)
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