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4.3.6 VLAN
VLANs are logical subgroups of a Local Area Network (LAN) created via software rather than defining a hardware solution.
VLANs combine user stations and network devices into a single domain regardless of the physical LAN segment to which
they are attached. VLANs allow network traffic to flow more efficiently within subgroups. VLANs managed through software
reduces the amount of time in which network changes are implemented.
VLANs have no minimum number of ports, and can be created per device or any other logical connection combination, as
VLANs are software based and not defined by physical attributes.
VLANs function at Layer 2. Since VLANs isolate traffic within the VLAN, a Layer 3 router functioning router is needed to
allows traffic flow between VLANs. Layer 3 routers identify segments and coordinate with VLANs. VLANs are broadcast
and Multicast domains. Broadcast and Multicast traffic is transmitted only in the VLAN in which the traffic is generated.
VLAN tagging provides a method of transferring VLAN information between VLAN groups. VLAN tagging attaches a tag to
packet headers. The VLAN tag indicates to which VLAN the packet belongs. VLAN tags are attached to the packet by
either the end station or by the network device. VLAN tags also contains VLAN network priority information. Combining
VLANs and GVRP enables the automatic dispersal of VLAN information.
The VLAN page contains links to the following topics:
• VLAN Membership
• Port Settings
• LAG Settings
• Protocol Group
• Protocol Port Table
• GVRP Parameters
VLAN Membership
The VLAN Membership page contains fields for defining VLAN groups. The device supports the mapping of 4094 VLAN
IDs to 256 VLANs. All ports must have a defined PVID. If no other value is configured the default VLAN PVID is used. VLAN
number 1 is the default VLAN, and cannot be deleted from the system.
To open VLAN Membership screen perform the folling:
1.
Click Switch -> VLAN -> VLAN Membership
2.
The VLAN Membership screen is displayed as in Figure 3-62
Figure 3-62 VLAN Membership screen
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