H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 52)

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• If the port (assuming that it is a dynamic member port) receives any MLD report in response to the
MLD multicast-address-specific query before its aging timer expires, it indicates that some host
attached to the port is receiving or expecting to receive IPv6 multicast data for that IPv6 multicast
group. The Layer 2 device resets the aging timer for the port.
• If the port receives no MLD report in response to the MLD multicast-address-specific query before its
aging timer expires, this means that no hosts attached to the port are still monitoring that IPv6
multicast group address. The Layer 2 device removes the port from the outgoing port list of the
forwarding table entry for that IPv6 multicast group when the aging timer expires.
MLD snooping proxying
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.
NOTE:
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.
Figure 12 Network diagram
As shown in Figure 12 , AC works as an MLD snooping proxy. As a host from the perspective of the
querier Router A, AC represents its attached hosts to send their membership reports and done messages
to Router A.
Table 3 describes how an MLD snooping proxy processes MLD messages.
Table 3 MLD message processing on an MLD snooping proxy
MLD message Actions
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.