3com S7906E 설치 설명서

 

1-4 

A switch running MLD snooping performs different actions when it receives different MLD messages, as 

follows:  

 

The description about adding or deleting a port in this section is only for a dynamic port. Static ports can 

be added or deleted only through the corresponding configurations. For details, see 

. 

 

The MLD querier periodically sends MLD general queries to all hosts and routers (FF02::1) on the local 

subnet to find out whether IPv6 multicast group members exist on the subnet.  

Upon receiving an MLD general query, the switch forwards it through all ports in the VLAN except the 

port on which it received the MLD query and performs the following:  

z 

If the port on which it the switch received the MLD query is a dynamic router port in its router port 

list, the switch resets the aging timer for this dynamic router port.  

z 

If the port is not included in its router port list, the switch adds it into its router port list as a dynamic 

router port and sets an aging timer for it.  

A host sends an MLD report to the MLD querier in the following circumstances:  

z 

Upon receiving an MLD query, an IPv6 multicast group member host responds with an MLD report.  

z 

When intended to join an IPv6 multicast group, a host sends an MLD report to the MLD querier to 

announce that it is interested in the multicast information addressed to that IPv6 multicast group.  

Upon receiving an MLD report, the switch forwards it through all the router ports in the VLAN, resolves 

the address of the reported IPv6 multicast group, and performs the following to the receiving port:  

z 

If no forwarding table entry exists for the reported IPv6 multicast group, the switch creates an entry, 

adds the port as a dynamic member port to the outgoing port list, and starts a member port aging 

timer for that port.  

z 

If a forwarding table entry exists for the reported IPv6 multicast group, but the port is not included in 

the outgoing port list for that group, the switch adds the port as a dynamic member port to the 

outgoing port list, and starts a member port aging timer for that port.  

z 

If a forwarding table entry exists for the reported IPv6 multicast group and the port is included in the 

outgoing port list, which means that this port is already a dynamic member port, the switch resets 

the member port aging timer for that port.