B&B Electronics 708TX - Manual - Manual (Page 145)

(Revised 2010-7-30) Page 145 of 154
VLAN Configuration Examples
A VLAN is an administratively configured LAN segment that limits the traffic in multiple broadcast domains. Instead of
physically reconnecting a device to a different LAN, network administrators can accomplish this task by configuring a
VLAN compliant switch to create logical network segments.
Tagged VLAN allows switch segmentation to span across multiple managed switches. This type of VLAN is ideal for
LANs that consist of various types of communication groups such as Office LANs, Controls Systems, and IP
Cameras. When used properly, it will effectively isolate two or more groups from each other in a logical manner. This
means that Broadcast, Multicast, and Unicast frames in one VLAN will not interfere with another isolated VLAN group.
Example 1 – Basic understanding of port-based VLANs
Receiving
Port # Tagged VID
in packet Destination
Address Transmitting
Port #s Notes
TX1 Untagged MAC on port TX2 TX2 Unicast Traffic
TX1 Untagged Unknown MAC TX2 Floods VLAN 2
TX1 VID 4 MAC on port TX2 -- Packet Discarded
TX3 Untagged MAC on port TX5 TX5 Unicast Traffic
TX3 Untagged Unknown MAC TX4-TX8 Floods VLAN 1
TX3 VID 4 MAC on port TX6 -- Packet Discarded