Configuring Mld Snooping; Overview; Mld Snooping Ports - HP MSR1002-4 Configuration Manual

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
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
IPv6 multicast packet transmission
without MLD snooping
Source
Host A
Receiver
IPv6 multicast packets

MLD snooping ports

As shown in
receiver hosts in an IPv6 multicast group. MLD snooping ports are divided into member ports and
router ports.
Figure 75, when MLD snooping is not enabled, the Layer 2 switch floods IPv6 multicast
Multicast router
Layer 2 switch
Host C
Receiver
Host B
Figure 76, MLD snooping runs on Switch A and Switch B, and Host A and Host C are
IPv6 multicast packet transmission
when MLD snooping runs
Source
Host A
Receiver
Host B
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Multicast router
Layer 2 switch
Host C
Receiver