Chapter 4: Web configuration
NS3552-8P-2S-V2 User Manual 111
VLAN basic information
The page includes the following fields:
Object Description
Mode Displays the current VLAN mode used by the industrial managed
switch:
Port-Based
IEEE 802.1Q VLAN
Maximum VLAN ID Maximum VLAN ID recognized by the industrial managed switch.
Maximum Number of
Supported VLANs
Maximum number of VLANs that can be configured on the industrial
managed switch.
Current number of VLANs Display the current number of VLANs
VLAN Learning Display the VLAN learning mode. The industrial managed switch
supports IVL (IVL Independent vlan learning).
Configurable PVID Tagging Indicates whether or not configurable PVID tagging is implemented.
VLAN port configuration
The Global VLAN Configuration page is used for configuring the industrial managed
switch port VLAN. This page contains fields for managing ports that are part of a VLAN.
The port default VLAN ID (PVID) is also configured on this page. All untagged packets
arriving to the device are tagged by the port’s PVID.
Managed switch nomenclature:
IEEE 802.1Q tagged and untagged
Every port on an 802.1Q compliant switch can be configured as tagged or untagged.
Tagged: Ports with tagging enabled put the VID number, priority, and other VLAN
information into the header of all packets that flow into those ports. If a packet has
previously been tagged, the port will not alter the packet, thus keeping the VLAN
information intact. The VLAN information in the tag can then be used by other 802.1Q
compliant devices on the network to make packet-forwarding decisions.
Untagged: Ports with untagging enabled strip the 802.1Q tag from all packets that flow
into those ports. If the packet doesn't have an 802.1Q VLAN tag, the port will not alter
the packet. Thus, all packets received by and forwarded by an untagging port have no
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