H3c-technologies H3C S3100V2 Series Switches Uživatelský manuál stáhnout pdf (Strana 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 Uživatelský manuál Strana 67