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4.5 VLAN
A Virtual LAN (VLAN) is a “logical” grouping of nodes for the purpose of
limiting a broadcast domain to specific members of a group without
physically grouping the members together. That means, VLAN allows you
to isolate network traffic so that only members of VLAN could receive traffic
from the same VLAN members. Basically, creating a VLAN from a switch is
the logical equivalent of physically reconnecting a group of network devices
to another Layer 2 switch, without actually disconnecting these devices
from their original switches.
JetNet 4508 V2/ 4508f V2 Series Industrial Ethernet Switch supports
802.1Q VLAN. 802.1Q VLAN is also known as Tag-Based VLAN. This
Tag-Based VLAN allows VLAN to be created across different switches (see
Figure 1). IEEE 802.1Q tag-based VLAN makes use of VLAN control
information stored in a VLAN header attached to IEEE 802.3 packet frames.
This tag contains a VLAN Identifier (VID) that indicates which VLAN a
frame belongs to. Since each switch only has to check a frame’s tag,
without the need to dissect the contents of the frame, this also saves a lot of
computing resources within the switch.
Figure 4.5-1 802.1Q VLAN
VLAN Configuration group enables you to Add/Remove VLAN, configure
port Ingress/Egress parameters and view VLAN table.
Following commands are included in this group:
4.5.1 VLAN Port Configuration
4.5.2 VLAN Configuration
4.5.3 GVRP Configuration
4.5.4 VLAN Table
4.5.5 CLI Commands of the VLAN
