User's Manual

504 CHAPTER 13: VLAN MANAGEMENT
Figure 260 Example of VLANs Distributed Amongst More Than One Switch
The Default VLAN A new or initialized switch contains a single VLAN, the default VLAN. This
VLAN has the following definition:
■ VLAN Name — typically Default VLAN or just Default
■ 802.1Q VLAN ID — 1 (if tagging required)
All ports on the switch are initially placed in this VLAN, untagged.
Communication between VLANs
Communication between two different VLANs can only take place if they
are connected to an appropriately configured router or a Layer 3 switch.
Alternatively, if the switch containing the VLANs is itself a Layer 3 switch
and is configured correctly, it will be able to route the traffic from one
VLAN to the other internally.
In an IP environment, communication between VLANs is achieved by
defining VLAN-based IP interfaces on a Layer 3 switch or router.
Commonly, each VLAN corresponds to one IP subnet, although it is
possible to have more than one IP subnet per VLAN.
For example, a network has two VLANs: one VLAN with ID 2 defines
devices on the subnet 192.168.50.0/255.255.255.0 and another VLAN
with ID 3 defines devices on the subnet 192.168.51.0/255.255.255.0.
For devices on one VLAN to communicate with devices on the other