KB.15.15

1 Static Virtual LANs

NOTE: All commands previously in the Summary of commands table are indexed under the entry

Command syntax.

General steps for using VLANs

VLANs enable grouping users by logical function instead of physical location. They make managing

bandwidth usage within networks possible by:

• Allowing grouping of high-bandwidth users on low-traffic segments

• Organizing users from different LAN segments according to their need for common resources

and individual protocols

• Improving traffic control at the edge of networks by separating traffic of different protocol

types.

• Enhancing network security by creating subnets to control in-band access to specific network

resources.

This chapter describes static VLANs configured for port-based or protocol-based operation.

Static VLANs are configured with a name, VLAN ID number (VID), and port members. For dynamic

VLANs, 802.1Q compatibility enables you to assign each switch port to multiple VLANs.

Some recommended steps to take for using VLANs:

1. Plan your VLAN strategy and create a map of the logical topology. Include consideration for

the interaction between VLANs and other features such as Spanning Tree Protocol, port trunking,

and IGMP. If you plan on usingdynamic VLANs, include the port configuration planning

necessary to support this feature.

By default, the switches covered in this guide are 802.1Q VLAN-enabled, allow for up to 256

static VLANs, and 2048 total static and dynamic VLANs.

2. Configure at least one VLAN in addition to the default VLAN.

3. Assign the desired switch ports to the new VLANs.

4. If you are managing VLANs with SNMP in an IP network, the VLAN through which you are

managing the switch must have an IP address.

Configuring VLANs

The Menu interface enables configuration and display of port-based VLANs only. The CLI configures

and displays port-based and protocol-based VLANs.

In the factory default state, the switch is enabled for up to 256 VLANs, all ports belong to the

default primary VLAN and are in the same broadcast/multicast domain. You can reconfigure the

switch to support up to 2048 VLANs, with up to 4094 VIDs, by adding new VLAN names and

VIDs, and then assigning one or more ports to each VLAN.

Per-port static VLAN configuration options

Options available to assign individual ports to a static VLAN are GVRP, if configured, which affects

these options and the VLAN behavior on the switch.

General steps for using VLANs 15