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

Configuring MLD

This chapter describes how to configure the Multicast Listener Discovery (MLD) on Cisco NX-OS devices
for IPv6 networks.
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Information About MLD

MLD is an IPv6 protocol that a host uses to request multicast data for a particular group. Using the information
obtained through MLD, the software maintains a list of multicast group or channel memberships on a
per-interface basis. The devices that receive MLD packets send the multicast data that they receive for requested
groups or channels out the network segment of the known receivers.
MLDv1 is derived from IGMPv2, and MLDv2 is derived from IGMPv3. IGMP uses IP Protocol 2 message
types, while MLD uses IP Protocol 58 message types, which is a subset of the ICMPv6 messages.
The MLD process is started automatically on the device. You cannot enable MLD manually on an interface.
MLD is automatically enabled when you perform one of the following configuration tasks on an interface:
• Enable PIM6
• Statically bind a local multicast group
• Enable link-local group reports

MLD Versions

The device supports MLDv1 and MLDv2. MLDv2 supports MLDv1 listener reports.
Information About MLD, on page 37
Licensing Requirements for MLD, on page 40
Prerequisites for MLD, on page 40
Guidelines and Limitations for MLD, on page 40
Default Settings for MLD, on page 41
Configuring MLD Parameters, on page 42
Verifying the MLD Configuration, on page 51
Configuration Examples for MLD, on page 51
Related Documents, on page 52
Standards, on page 52
Feature History for MLD, on page 52
C H A P T E R
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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