H3c-technologies H3C S3100V2 Series Switches Bedienungsanleitung PDF herunterladen (Seite 67)

MLD snooping forwards multicast data to only the receivers that require 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 22, Router A connects to the multicast source, MLD snooping runs on Switch A and

Switch B, Host A and Host C are receiver hosts—namely, IPv6 multicast group members.

Figure 22 MLD snooping related ports

Ports involved in MLD snooping, as shown in Figure 22, are described as follows:

• Router port—A router port is a port on the Ethernet switch that leads the switch toward the Layer-3

multicast device—DR or MLD querier. In the figure, Ethernet 1/0/1 of Switch A and Ethernet 1/0/1

of Switch B are router ports. The switch registers all its local router ports in its router port list.

• Member port—A member port—also known as “IPv6 multicast group member port”—is a port on

the Ethernet switch that leads toward multicast group members. In the figure, Ethernet 1/0/2 and

Ethernet 1/0/3 of Switch A and Ethernet 1/0/2 of Switch B are member ports. The switch registers

all the member ports on the local switch in its MLD snooping forwarding table.

NOTE:

• In this document, a router port is a router-connectin

port on the switch, rather than a port on a router.

• Unless otherwise specified, router ports and member ports in this document include static and dynamic

ports.

• On an MLD snooping-enabled switch, the ports that received MLD general queries with the source

address other than 0::0 or IPv6 PIM hello messages are dynamic router ports.

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H3c-technologies H3C S3100V2 Series Switches Bedienungsanleitung Seite 67