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MLD Configuration
The term "router" in this document refers to a router in a generic sense or a Layer 3 switch running the
MLD protocol.
When configuring MLD, go to the following sections for information you are interested in:
MLD Overview
Configuration Task List
Displaying and Maintaining MLD Configuration
MLD Configuration Examples
Troubleshooting MLD
MLD Overview
The Multicast Listener Discovery protocol (MLD) is used by an IPv6 router to discover the presence of
multicast listeners on the directly attached subnets. Multicast listeners are nodes wishing to receive
IPv6 multicast packets.
Through MLD, the router can learn whether there are any IPv6 multicast listeners on the directly
connected subnets, put corresponding records in the database, and maintain timers related to IPv6
multicast addresses.
Routers running MLD use an IPv6 unicast link-local address as the source address to send MLD
messages. MLD messages are Internet Control Message Protocol for IPv6 (ICMPv6) messages. All
MLD messages are confined to the local subnet, with a hop count of 1.
MLD Versions
So far, two MLD versions are available:
MLDv1 (defined in RFC 2710), which is derived from IGMPv2.
MLDv2 (defined in RFC 3810), which is derived from IGMPv3.
All MLD versions support the Any-Source Multicast (ASM) model. In addition, MLDv2 can be directly
deployed to implement the Source-Specific Multicast (SSM) model, while MLDv1 needs to work with the
MLD SSM mapping function to implement SSM service.
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Troubleshooting
