Configuring Vlans; Understanding Vlans - Cisco Catalyst 3560-X Software Configuration Manual

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Configuring VLANs

This chapter describes how to configure normal-range VLANs (VLAN IDs 1 to 1005) and

extended-range VLANs (VLAN IDs 1006 to 4094) on the Catalyst 3750-X or 3560-X switch. It includes

information about VLAN membership modes, VLAN configuration modes, VLAN trunks, and dynamic

VLAN assignment from a VLAN Membership Policy Server (VMPS). Unless otherwise noted, the term

switch refers to a Catalyst 3750-X or 3560-X standalone switch and to a Catalyst 3750-X switch stack.

For complete syntax and usage information for the commands used in this chapter, see the command

reference for this release.

The chapter consists of these sections:

A VLAN is a switched network that is logically segmented by function, project team, or application,

without regard to the physical locations of the users. VLANs have the same attributes as physical LANs,

but you can group end stations even if they are not physically located on the same LAN segment. Any

switch port can belong to a VLAN, and unicast, broadcast, and multicast packets are forwarded and

flooded only to end stations in the VLAN. Each VLAN is considered a logical network, and packets

destined for stations that do not belong to the VLAN must be forwarded through a router or a switch

supporting fallback bridging, as shown in

across the stack. Because a VLAN is considered a separate logical network, it contains its own bridge

Management Information Base (MIB) information and can support its own implementation of spanning

Before you create VLANs, you must decide whether to use VLAN Trunking Protocol (VTP) to maintain

global VLAN configuration for your network. For more information on VTP, see

"Configuring VTP."

Understanding VLANs, page 1-1

Configuring Normal-Range VLANs, page 1-4

Configuring Extended-Range VLANs, page 1-10

Displaying VLANs, page 1-14

Configuring VLAN Trunks, page 1-14

Configuring VMPS, page 1-26

Chapter 1, "Configuring STP."

C H A P T E R

1-1. In a switch stack, VLANs can be formed with ports

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

Catalyst 3750-x