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Chapter 4: Web configuration
NS3562-8P-2S User Manual
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The page includes the following fields:
Object
Description
VLAN ID
Displays the current VLAN ID entry.
VLAN Name
Display the current VLAN ID name
VLAN Type
Display the current VLAN ID type
Modify
Click
Edit
to modify VLAN configuration
Interface settings
This 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
802.1Q VLAN information (remember that the PVID is only used internally within the
industrial managed switch). Untagging is used to send packets from an 802.1Q-
compliant network device to a non-compliant network device.
Frame Income
Frame Leave
Income Frame is
tagged
Income Frame is
untagged
Leave port is tagged
Frame remains tagged
Tag is inserted
Leave port is untagged
Tag is removed
Frame remains untagged
IEEE 802.1Q tunneling (Q-in-Q)
IEEE 802.1Q tunneling (Q-in-Q) is designed for service providers carrying traffic for
multiple customers across their networks. Q-in-Q tunneling is used to maintain
customer-specific VLAN and Layer 2 protocol configurations even when different
customers use the same internal VLAN IDs. This is accomplished by inserting Service
Provider VLAN (SPVLAN) tags into the customer’s frames when they enter the service
provider’s network, and then stripping the tags when the frames leave the network.