Overview

The IPv6 address scheme uses hexadecimal FF at the start of an address for IPv6 multicast. MLD is a protocol that uses these addresses. The following addresses have specific functions:

• You can assign only multicast addresses of global-scope (that is, containing an FFxE prefix, where x is the flags field) to a multicast group.
• FF02::1 is the link-scope all-nodes address—A packet sent to this address reaches all nodes on a subnetwork.
• FF02::2 is the link-scope all-routers address—A packet sent to this address reaches all routers on a subnetwork.
• FF02::16 is the link-scope all-MLDv2 routers address—A packet sent to this address reaches all MLDv2 routers on a subnetwork.

This implementation of MLD complies with MLD versions 1 and 2. MLDv2 allows for source-specific join and leave messages and is backward compatible with MLDv1. Configuring MLDv1 with the SSM mapping feature provides support for source-specific joins.

MLDv1 mode interfaces exchange the following types of messages between routers and hosts:

• Multicast listener queries
• Multicast listener reports
• Multicast listener done messages

MLDv2 mode interfaces exchange the following types of messages with MLDv2 hosts:

• Multicast listener queries
• MLDv2 multicast listener reports

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