S Layer 2 Managed Switch User Manual
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MAC
VID
Member
01:00:5E:01:02:03
1
1, 10
Switch establish this table ,passed this switch destination MAC address is 01:00:5E:01:02:03,VID 1 data package will be
transmitted between port 1 and port 10 for multicast table find this item .other multicast package broadcast in switch VLAN
for not finding corresponding item in multicast table.
When switch recevied multicast group and this multicast group existed ,switch add received IGMP REPORT port in this
multicast group , as above fig showed ,supposed port 1 and port 10 established multicast group ,mainboard B connected to
port 11,after port 11 recevied IGMP Query ,it send IGMP Report to switch . received this report ,switch add port 11 in
established multicast table.switch multicast table changed as following:
MAC
VID
Member
01:00:5E:01:02:03
1
1
，
10
，
11
Multicast group leave:
When multicast group established ,switch monitor IGMP Query sent from multicast mainboard and decide whether delete
port from multicast group.Or there is no port in this multicast,this multicast will be deleted.Take above fig as an example,
mainboard A connected to switch port 10 leave this multicast group,they will send IGMP Leave massage to switch.If switch
configuration of “ member leave will be deleted function” is open , switch will delete port 10. Now switch multicast group is
changed as following fig:
MAC
VID
Member
01:00:5E:01:02:03
1
1, 11
If mainboard B connected to port 11 aslo want to leave this multicast group,they will send IGMP Leave massage to
switch.Switch find port 11 is the last mainboard port in this multicast,switch will delete this multicast entry in switch. Package
which passed switch destination MAC is 01:00:5E:01:02:03 ,broadcast VID 1 package .
“Member leave will be delete “function
This function is setting switch whether delete the port from multicast group when this port received multicast group leave
message .Normally, switch will delete this port when received leave message .At particular network environment,switch can
delete multicast group in over aging time method and close “ Member left will be delete “ function ,the environment as
following fig:
