Administrator Guide

Virtual LANs (VLANs)
Virtual LANs (VLANs) are a logical broadcast domain or logical grouping of interfaces in a local area network (LAN) in which all data
received is kept locally and broadcast to all members of the group.
When in Layer 2 mode, VLANs move trac at wire speed and can span multiple devices. The system supports up to 4093 port-based
VLANs and one default VLAN, as specied in IEEE 802.1Q.
VLANs benets include:
• Improved security because you can isolate groups of users into dierent VLANs
• Ability to create one VLAN across multiple devices
For more information about VLANs, refer to the IEEE Standard 802.1Q Virtual Bridged Local Area Networks. In this guide, also refer to:
• Bulk Conguration in the Interfaces chapter.
• VLAN Stacking in the Service Provider Bridging chapter.
For a complete listing of all commands related to Dell Networking OS VLANs, refer to these Dell Networking OS Command Reference
Guide chapters:
• Interfaces
• 802.1X
• GARP VLAN Registration Protocol (GVRP)
• Service Provider Bridging
• Per-VLAN Spanning Tree Plus (PVST+)
The following table lists the defaults for VLANs in Dell Networking OS.
Feature
Default
Spanning Tree group
ID
All VLANs are part of Spanning Tree group 0.
Mode Layer 2 (no IP address is assigned).
Default VLAN ID VLAN 1
Topics:
• Default VLAN
• Port-Based VLANs
• VLANs and Port Tagging
• Conguration Task List
• Conguring Native VLANs
• Enabling Null VLAN as the Default VLAN
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