Инструкции По Установке для 3com S7906E

 

1-22 

On an MLD snooping proxy, MLD membership reports are suppressed if the entries for the 

corresponding groups exist in the forwarding table, no matter the suppression function is enabled or 

not. 

 

By configuring the maximum number of IPv6 multicast groups that can be joined on a port or a group of 

ports, you can limit the number of multicast programs available to VOD users, thus to control the traffic 

on the port.  

Follow these steps configure the maximum number of IPv6 multicast groups that can be joined on a port 

or a group of ports:  

Enter system view 

— 

interface interface-type 
interface-number 

Enter Ethernet port/ONU 
port/Layer 2 aggregate 
interface view or port group 
view 

port-group manual 
port-group-name 

Required 

Use either approach 

Configure the maximum 
number of IPv6 multicast 
groups that can be joined on a 
port  

mld-snooping group-limit 
limit [ vlan vlan-list ] 

Optional 

512 by default.  

 

z 

When the number of IPv6 multicast groups that can be joined on a port reaches the maximum 

number configured, the system deletes all the forwarding entries persistent to that port from the 

MLD snooping forwarding table, and the hosts on this port need to join IPv6 multicast groups again.  

z 

If you have configured static or simulated joining on a port, however, when the number of IPv6 

multicast groups on the port exceeds the configured threshold, the system deletes all the 

forwarding entries persistent to that port from the MLD snooping forwarding table and applies the 

static or simulated joining again, until the number of IPv6 multicast groups joined by the port comes 

back within the configured threshold.  

 

For some special reasons, the number of IPv6 multicast groups passing through a switch or port may 

exceed the number configured for the switch or the port. In addition, in some specific applications, an 

IPv6 multicast group newly joined on the switch needs to replace an existing IPv6 multicast group 

automatically. A typical example is “channel switching”, namely, by joining the new multicast group, a 

user automatically switches from the current IPv6 multicast group to the new one.