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For example: If configure VLAN to VLAN2, it must have members (Like as port 2 and port3), then port
2 and port 3 can access switch regularly.
（
Figure 6.4.4
）
Port VID
：
The default configuration of port VID
（
Figure 6.4.5
）
1. Keeping the same VID
If data did not have VLAN mark, created VLAN mark with default priority and port VID and add to data
frame, priority did not change. If data have VLAN mark, the data frame did not change, priority did not
change.
2. Replace identification VID with default VID
If data did not have VLAN mark, created VLAN mark with default priority and port VID and add to data
frame, if data have VLAN mark,
VLAN mark‟s VID will be replace by default port VID
For example: Set port 2 and port 3 into VLAN2, PVID is 2, port 4 and port 5 into VLAN 3, PVID is 3,
Choice” Keep VID and priority”, then port 2 and port 3 can communication, port 4 and port 5 can
communicate, port 2 and port 3 cannot communicate with port 4 and port 5.
6.4.3 IGMP Snooping
IP host applies to join (or leave) multicast group to the neighboring router through IGMP (Internet
Group Management Protocol) protocol. IGMP Snooping is multicast constraining mechanism. It manages
and controls multicast group by snooping and analysis of the IGMP messages between the host and the
multicast device.
Work process of IGMP Snooping: the switch snoops messages between the host computer and the
router and tracks multicast information and the port applied for. When the switch snoops IGMP Report
message sent from the host computer to the router, the switch would add this port to multicast forwarding
list; when the switch snoops IGMP Leave message sent by the host computer, the router will send
Group-Specific Query message of this port. If other hosts need this multicast, then the rely IGMP Report
message. If the router doesn't get any reply from the hosts, the switch would delete this port from the
multicast forwarding list. The router will send IGMP Query message regularly, the switch will deletes the
port from the multicast forwarding list if it doesn't get the IGMP Report message from the host.
IGMP Snooping:
Enable or disable IGMP snooping function
IGMP Query:
Enable or disable IGMP query function
