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 datareceived is kept locally and broadcast to all members of the group.When in Layer 2 mode, VLANs move traffic at wire speed and can span multiple devices. The system supports up to 4093 port-basedVLANs and one default VLAN, as specified in IEEE 802.1Q.VLANs benefits include:• Improved security because you can isolate groups of users into different VLANs• Ability to create one VLAN across multiple devicesFor more information about VLANs, refer to the IEEE Standard 802.1Q Virtual Bridged Local Area Networks. In this guide, also refer to:• Bulk Configuration 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 ReferenceGuide 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 DefaultSpanning Tree groupIDAll VLANs are part of Spanning Tree group 0.Mode Layer 2 (no IP address is assigned).Default VLAN ID VLAN 1Topics:• Default VLAN• Port-Based VLANs• VLANs and Port Tagging• Configuration Task List• Configuring Native VLANs• Enabling Null VLAN as the Default VLAN55Virtual LANs (VLANs) 859
