XS1930 Series User’s Guide
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CHAPTER 9
VLAN
9.1 Overview
This chapter shows you how to configure 802.1Q tagged and port-based VLANs.
The type of screen you see here depends on the VLAN Type you selected in the Switch Setup screen.
9.1.1 What You Can Do
• Use the VLAN screen (Section 9.3 on page 122) to view and search all static VLAN groups.
• Use the VLAN Detail screen (Section 9.3.1 on page 123) to view detailed port settings and status of the
static VLAN group.
• Use the Static VLAN Setup screen (Section 9.5 on page 125) to configure a static VLAN for the Switch.
• Use the VLAN Port Setup screen (Section 9.6 on page 126) to configure the static VLAN (IEEE 802.1Q)
settings on a port.
• Use the Voice VLAN Setup screen (Section 9.7 on page 127) to set up VLANs that allow you to group
voice traffic with defined priority and enable the Switch port to carry the voice traffic separately from
data traffic to ensure the sound quality does NOT deteriorate.
• Use the Vendor ID Based VLAN Setup screen (Section 9.8 on page 129) to set up VLANs that allow you
to group untagged packets into logical VLANs based on the source MAC address of the packet. You
can specify a mask for the MAC address to create a MAC address filter and enter a weight to set the
VLAN rule’s priority.
• Use the Port-Based VLAN Setup screen (Section 9.9 on page 131) to set up VLANs where the packet
forwarding decision is based on the destination MAC address and its associated port.
9.1.2 What You Need to Know
Read this section to know more about VLAN and how to configure the screens.
9.2 Introduction to IEEE 802.1Q Tagged VLANs
A tagged VLAN uses an explicit tag (VLAN ID) in the MAC header to identify the VLAN membership of a
frame across bridges
– they are not confined to the switch on which they were created. The VLANs can
be created statically by hand or dynamically through GVRP. The VLAN ID associates a frame with a
specific VLAN and provides the information that switches need to process the frame across the network.
A tagged frame is 4 bytes longer than an untagged frame and contains 2 bytes of TPID (Tag Protocol
Identifier, residing within the type or length field of the Ethernet frame) and 2 bytes of TCI (Tag Control
Information, starts after the source address field of the Ethernet frame).
The CFI (Canonical Format Indicator) is a single-bit flag, always set to zero for Ethernet switches. If a
frame received at an Ethernet port has a CFI set to 1, then that frame should not be forwarded as it is to
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