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9033645-01 Virtual LANs (VLANs) 91
APPENDIX B. VIRTUAL LANS (VLANS)
VLANs and Frame Tagging
The VH-2402S switch supports IEEE 802.1Q-compliant virtual LANs
(VLANs). This capability provides a highly efficient architecture for
establishing VLANs within a network and for controlling broadcast/
multicast traffic between workgroups. Central to this capability is an
explicit frame tagging approach for carrying VLAN information between
interconnected network devices.
With frame tagging, a four byte data tag field is appended to frames that
cross the network. The tag identifies which VLAN the frame belongs to.
The tag may be added to the frame by the end station itself or by a
network device, such as a switch. In addition to VLAN information, the
relative priority of the frame in the network can specified by the tag (see
Appendix C, “Class of Service”).
VLANs provide greater network efficiency by reducing broadcast traffic,
but also allow you to make network changes without having to update IP
addresses or IP subnets. VLANs inherently provide a high level of
network security, since traffic must pass through a Layer 3 switch or a
router to reach a different VLAN.
This switch supports the following VLAN features:
• Up to 256 VLANs based on the IEEE 802.1Q standard
• Distributed VLAN learning across multiple switches using explicit or
implicit tagging and GARP/GVRP protocol
• Port overlapping, allowing a port to participate in multiple VLANs
• End stations can belong to multiple VLANs
• Passing traffic between VLAN-aware and VLAN-unaware devices
• Two-level priority tagging
• Port trunking with VLANs