Overview; Multicast Listener Queries - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

JUNOSe 11.0.x Multicast Routing Configuration Guide

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

Multicast Listener Queries

A multicast router can be a querier or a nonquerier. There is only one querier on a
network at any time. Multicast routers monitor queries from other multicast routers
to determine the status of the querier. If the querier hears a query from a router with
a lower IPv6 address, it relinquishes its role to that router.
MLDv1 and MLDv2 mode interfaces send two types of multicast listener queries to
hosts on the network:
MLDv2 mode interfaces send the following type of queries to MLDv2 hosts:
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Overview
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.
Multicast listener queries
Multicast listener reports
Multicast listener done messages
Multicast listener queries
MLDv2 multicast listener reports
General queries to the all-nodes address (FF02::1)
Specific queries to the appropriate multicast group address
General queries