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Configuring MLD snooping
Overview
MLD snooping runs on a Layer 2 device as an IPv6 multicast constraining mechanism to improve
multicast forwarding efficiency. It creates Layer 2 multicast forwarding entries from MLD messages
that are exchanged between the hosts and the router.
As shown in Figure 75, when MLD snooping is not enabled, the Layer 2 switch floods IPv6 multicast
packets to all hosts in a VLAN. When MLD snooping is enabled, the Layer 2 switch forwards
multicast packets of known IPv6 multicast groups to only the receivers.
Figure 75 Multicast packet transmission processes without and with MLD snooping
MLD snooping ports
As shown in Figure 76, MLD snooping runs on Switch A and Switch B, and Host A and Host C are
receiver hosts in an IPv6 multicast group. MLD snooping ports are divided into member ports and
router ports.
IPv6 multicast packet transmission
without MLD snooping
Source
Multicast router
Host A
Receiver
Host B
Host C
Receiver
IPv6 multicast packets
Layer 2 switch
IPv6 multicast packet transmission
when MLD snooping runs
Source
Multicast router
Host A
Receiver
Host B
Host C
Receiver
Layer 2 switch
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