Virtual Local Area Network (VLAN)
7278_en_04 PHOENIX CONTACT 6-1
6 Virtual Local Area Network (VLAN)
6.1 Basics
VLAN A VLAN is a closed network, which is separated logically/functionally rather than physically
from the other networks. A VLAN creates its own broadcast and multicast domain, which is
defined by the user according to specified logical criteria. VLANs are used to separate the
physical and the logical network structure.
– Data packets are only forwarded within the relevant VLAN
– The members of a VLAN can be distributed over a large area
The reduced propagation of broadcasts and multicasts increases the available bandwidth
within a network segment. In addition, the strict separation of the data traffic increases
system security.
A router or similar Layer 3 device is required for data traffic between VLANs.
For the switch, the VLANs can be created statically or dynamically. For dynamic
configuration, the data frames are equipped with a tag. A tag is an extension within a data
frame that indicates the VLAN assignment. If configured correspondingly, this tag can be
added or removed again from the last tag during the transmission of the first switch in the
transmission chain. Several different VLANs can thus use the same switches/infrastructure
components. Alternatively, termination devices that support VLAN tags can also be used.
6.2 Enabling the VLAN web pages in web-based
management
Activate web-based management for the switches, e.g., using the Factory Manager, switch
to the "General Configuration" menu, then the "User Interfaces" page. Activate the "VLAN"
function and confirm by entering your password.
When activating "VLAN" under "User Interfaces", the VLAN mechanism is not activated.
In the WBM menu, the "VLAN" page - under which the function can be configured and
activated - is enabled.
When deactivating the VLAN configuration pages under "User Interfaces", the VLAN
mechanism is not deactivated. The saved VLAN configuration is retained.
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