H3C Technologies H3C S7500E Series Switches - Manual (Page 321)

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MLD Configuration
z The term “router” in this document refers to a router in a generic sense or a Layer 3 switch
running the MLD protocol.
z The S7500E Series Ethernet Switches are distributed devices that support Intelligent Resilient
Framework (IRF). Two S7500E series can be connected together to form a distributed IRF device.
If an S7500E series is not in any IRF, it operates as a distributed device; if the S7500E series is in
an IRF, it operates as a distributed IRF device. For introduction of IRF, refer to IRF Configuration
in the IRF Configuration Guide.
z EA cards (such as LSQ1GP12EA and LSQ1TGX1EA) do not support IPv6 features.
When configuring MLD, go to the following sections for information you are interested in:
z MLD Overview
z Configuration Task List
z Displaying and Maintaining MLD Configuration
z MLD Configuration Examples
z 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:
z MLDv1 (defined in RFC 2710), which is derived from IGMPv2.
z MLDv2 (defined in RFC 3810), which is derived from IGMPv3.