Инструкции По Установке для 3com S7906E

 

1-6 

You can configure the MLD snooping proxying function on an edge device to reduce the number of MLD 

reports and done messages sent to its upstream device. The device configured with MLD snooping 

proxying is called an MLD snooping proxy. It is a host from the perspective of its upstream device. 

 

Even though an MLD Snooping proxy is a host from the perspective of its upstream device, the MLD 

membership report suppression mechanism for hosts does not take effect on it. For the MLD report 

suppression mechanism for hosts, refer to MLD Configuration in the IP Multicast volume.  

 

Figure 1-3 Network diagram for MLD snooping proxying 

 

 

 

As shown in 

, Switch A works as an MLD Snooping proxy. As a host from the perspective of 

the querier Router A, Switch A represents its attached hosts to send their membership reports and done 

messages to Router A.  

 describes how an MLD Snooping proxy processes MLD messages.  

Table 1-2 MLD message processing on an MLD snooping proxy 

General query 

When receiving an MLD general query, the proxy forwards it to all ports but the 
receiving port. In addition, the proxy generates a report according to the group 
memberships it maintains and sends the report out all router ports.  

Multicast-addr
ess-specific 
query 

In response to the MLD group-specific query for a certain IPv6 multicast group, the 
proxy sends the report to the group out all router ports if the forwarding entry for 
the group still contains a member port.