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CHAPTER

12-1

Catalyst 2960 Switch Software Configuration Guide

OL-8603-04

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 2960 switch. It includes information

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

assignment from a VLAN Membership Policy Server (VMPS).

Note 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:

• Understanding VLANs, page 12-1

• Configuring Normal-Range VLANs, page 12-4

• Configuring Extended-Range VLANs, page 12-11

• Displaying VLANs, page 12-13

• Configuring VLAN Trunks, page 12-14

• Configuring VMPS, page 12-23

Understanding VLANs

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 Figure 12-1. 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 tree. See Chapter 15, “Configuring STP.”

Note 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 Chapter 13,

“Configuring VTP.”

1 2 3 4 5 6 ... 29 30

Inhaltsverzeichnis

Seite 1 - Configuring VLANs

CHAPTER 12-1Catalyst 2960 Switch Software Configuration GuideOL-8603-0412Configuring VLANsThis chapter describes how to configure normal-range VLANs (

Seite 2 - Supported VLANs

12-10Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsCaution When you delet

Seite 3 - VLAN Port Membership Modes

12-11Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Extended-Range VLANsTo return an interfa

Seite 4

12-12Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Extended-Range VLANsExtended-Range VLAN

Seite 5 - Token Ring VLANs

12-13Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsDisplaying VLANsTo delete an extended-range VLAN, us

Seite 6 - Saving VLAN Configuration

12-14Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksFor more details about the sh

Seite 7

12-15Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksIEEE 802.1Q Configuration Con

Seite 8

12-16Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksDefault Layer 2 Ethernet Inte

Seite 9 - Deleting a VLAN

12-17Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN Trunks• If you try to enable IEEE 8

Seite 10 - OL-8603-04

12-18Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksDefining the Allowed VLANs on

Seite 11 - Default VLAN Configuration

12-19Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksTo return to the default allo

Seite 12

12-2Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsUnderstanding VLANsFigure 12-1 shows an example of VL

Seite 13 - Displaying VLANs

12-20Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksFor information about IEEE 80

Seite 14 - Configuring VLAN Trunks

12-21Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN Trunks• VLANs 3 through 6 are assig

Seite 15

12-22Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VLAN TrunksLoad Sharing Using STP Path C

Seite 16

12-23Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSConfiguring VMPSThe VLAN Query Proto

Seite 17 - Configuring a Trunk Port

12-24Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSUnderstanding VMPSEach time the clie

Seite 18

12-25Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSDynamic-access ports can be used for

Seite 19

12-26Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSEntering the IP Address of the VMPSY

Seite 20

12-27Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSTo return an interface to its defaul

Seite 21

12-28Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSChanging the Retry CountBeginning in

Seite 22

12-29Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSThis is an example of output for the

Seite 23 - Configuring VMPS

12-3Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsUnderstanding VLANsVLAN Port Membership ModesYou conf

Seite 24 - Understanding VMPS

12-30Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring VMPSFigure 12-4 Dynamic Port VLAN Member

Seite 25 - Configuring the VMPS Client

12-4Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsConfiguring Normal-Rang

Seite 26

12-5Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsThese sections contain

Seite 27 - Reconfirming VLAN Memberships

12-6Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsare several adjacent sw

Seite 28 - Monitoring the VMPS

12-7Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsWhen you save VLAN and

Seite 29 - VMPS Configuration Example

12-8Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsCreating or Modifying a

Seite 30

12-9Catalyst 2960 Switch Software Configuration GuideOL-8603-04Chapter 12 Configuring VLANsConfiguring Normal-Range VLANsYou can also create or

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