3com S7906E 安装指导
1-2
Figure 1-1 Before and after MLD snooping is enabled on the Layer 2 device
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
MLD snooping forwards multicast data to only the receivers requiring it at Layer 2. It brings the following
advantages:
z
Reducing Layer 2 broadcast packets, thus saving network bandwidth.
z
Enhancing the security of multicast traffic.
z
Facilitating the implementation of per-host accounting.
Basic Concepts in MLD Snooping
MLD Snooping related ports
As shown in
, 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 1-2 MLD snooping related ports
Router A
Switch A
Switch B
GE2/0/1
GE2/0/2
GE2/0/3
GE2/0/1
GE2/0/2
Receiver
Receiver
Host A
Host B
Host C
Host D
Source
IPv6 multicast packets
Router port
Member port
, are described as follows: