Basic Concepts In Mld Snooping - H3C S3100 Series Operation Manual

Figure 3-1 Before and after MLD snooping is enabled on the Layer 2 device
IPv6 multicast packet transmission
without MLD Snooping
Source
Host A
Receiver
IPv6 multicast packets
MLD snooping forwards multicast data to only the receivers requiring it at Layer 2. It brings the following
advantages:
Reducing Layer 2 broadcast packets, thus saving network bandwidth.
Enhancing the security of multicast traffic.
Facilitating the implementation of per-host accounting.

Basic Concepts in MLD Snooping

MLD Snooping related ports
As shown in Figure
Switch B, Host A and Host C are receiver hosts (namely, IPv6 multicast group members).
Figure 3-2 MLD snooping related ports
Router A
Router port
Member port
IPv6 multicast packets
Multicast router
Layer 2 switch
Host C
Receiver
Host B
3-2, Router A connects to the multicast source, MLD snooping runs on Switch A and
Switch A
Eth1/0/1 Eth1/0/2
Eth1/0/3
Eth1/0/1
Eth1/0/2
Switch B
IPv6 multicast packet transmission
when MLD Snooping runs
Source
Host A
Receiver
Host B
Receiver
Host A
Host B
Receiver
Host C
Host D
3-2
Multicast router
Layer 2 switch
Host C
Receiver