Licensing Requirements For Igmp Snooping; Prerequisites For Igmp Snooping; Guidelines And Limitations For Igmp Snooping - Cisco Nexus 7000 Series Configuration Manual

Configuring IGMP Snooping
By snooping IGMP packets received on a link, the device sends multicast packets only to interested end points.
Once an IGMP packet going over the Layer 2 link is snooped, it is passed to the control plane. The control
plane will add the link on which it was received to the multicast group. The IGMP packets coming on the
pseudowire are also snooped and sent to the control plane. The control plane then adds the pseudowire to the
multicast group. When a multicast packet is received, it will be sent only to the multicast group instead of
flooding the VLAN.

Licensing Requirements for IGMP Snooping

Product
Cisco NX-OS

Prerequisites for IGMP Snooping

IGMP snooping has the following prerequisites:
• You are logged onto the device.
• You are in the correct virtual device context (VDC). A VDC is a logical representation of a set of system
• For global commands, you are in the correct virtual routing and forwarding (VRF) mode. The default

Guidelines and Limitations for IGMP Snooping

IGMP snooping has the following guidelines and limitations:
• You must disable IGMP optimized multicast flooding (OMF) for IPv6 multicast networks that require
• You must disable IGMP optimized multicast forwarding on VLANs that require forwarding of IPv6
• When a vPC peer-link runs in a F2 module, IGMP querier election does not happen. Hence do not
• If you are configuring vPC peers, the differences in the IGMP snooping configuration options between
resources. You can use the switchto vdc command with a VDC number.
configuration mode shown in the examples in this chapter applies to the default VRF.
multicast forwarding over a layer 2 network.
packets.
configure vPC peer-link in a F2 module.
the two devices have the following results:
• If IGMP snooping is enabled on one device but not on the other, the device on which snooping is
disabled floods all multicast traffic.
• A difference in multicast router or static group configuration can cause traffic loss.
License Requirement
IGMP snooping requires no license. Any feature not
included in a license package is bundled with the
Cisco NX-OS system images and is provided at no
extra charge to you. For a complete explanation of
the Cisco NX-OS licensing scheme, see Cisco NX-OS
Licensing Guide.
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide

Licensing Requirements for IGMP Snooping

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