MLD (Multicast Listener Discovery)

MLD-topology

MLD (Multicast Listener Discovery)

Multicast Listener Discovery (MLD) is the IPv6 Multicast Group Membership Protocol. It works between the Multicast Routers and the multicast hosts with Query,Report and Leave Messages. MLD works between MLD Querier router and the hosts. It controls multicast member joins and leaves.


MLD-topology
There are two versions of MLD (Multicast Listener Discovery). These MLD versions are:

• MLDv1
• MLDv2

Let’s look deeper to these MLD versions.

MLDv1

MLDv1 is the default MLD version. The working principles are like IGMPv2. With MLDv1, Multicast receivers can receive multicast traffic from any Multicast Sources. They have no option for Multicsat Source selection.

There are three message types in MLDv1. These messages types are:

• Listener Query (Type 130) (General or Multicast Group Specific)
• Listener Report (Type 131)
• Listener Leave (Done) (Type 132)

Listener Query message is used to find if are there any multicast traffic receivers (Querior to Receivers).
Listener Report message is used to join a multicast group (Receivers to Queriers).
Listener Leave message is used to leave a multicast group (Receivers to Queriers).

The type of the message is specified in the type field in the MLD Header. You can find the MLDv1 Header fields below:

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Lesson tags: Multicast, mld
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