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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
72 Switch Management and Operating Concepts
VLANs
A VLAN is a collection of end nodes grouped by logic rather
than physical location. End nodes that frequently
communicate with each other are assigned to the same VLAN,
regardless of where they are located physically on the network.
Logically, a VLAN can be equated to a broadcast domain,
because broadcast packets are forwarded only to members of
the VLAN on which the broadcast was initiated.
Notes About VLANs on the DES-3326S
1. The DES-3326S supports IEEE 802.1Q VLANs.
The port untagging function can be used to
remove the 802.1Q tag from packet headers to
maintain compatibility with devices that are tag-
unaware (that is, network devices that do not
support IEEE 802.1Q VLANs or tagging).
2. The switch’s default - in both Layer 2 Only
mode and IP Routing mode - is to assign all
ports to a single 802.1Q VLAN named
DEFAULT_VLAN.
3. The switch allows the assignment of an IP
interface to each VLAN, in IP Routing mode.
The VLANs must be configured before setting up
the IP interfaces
4. A VLAN that is not assigned an IP interface will
behave as a layer 2 VLAN – and IP routing, by
the switch, will not be possible to this VLAN
regardless of the switch’s operating mode.