how to configure vlan

PREPARED BY RAVI KUMAR LANKE

How to Configure VLAN, STP, DTP step by step guide

http://computernetworkingnotes.com/switching-vlan-stp-vtp-dtp-ether-channels/configure-vlan-vtp.html


In this tutorial I will demonstrate that how can you

Configure Access or Trunk links

Create VLAN

Assign VLAN membership

Configure Intra VLAN routing

Configure VTP Server

Make VTP Clients

Show STP Static

Configure DTP port

To complete these lab either create a topology as shown in figure or download this file and load it in packet tracer

Download Advance switch configuration packet tracer file

PC configurations 2960 – 24 TTL Switch 1 Configuration

http://computernetworkingnotes.com/images/ccna_certifications/download/switching_basic.pkt


http://computernetworkingnotes.com/switching-vlan-stp-vtp-dtp-ether-channels/configure-vlan-vtp/print.html



Devices IP

Address VLAN

Connected

With

PC0 10.0.0.2 VLAN10 Switch1 on

F0/1


F0/2


F0/1


F0/2


F0/1


F0/2

Port

Connected to VLAN LINK STATUS

F0/1 With

PC0 VLAN10 Access OK

F0/2 With


Gig1/1 With

Router

VLAN

10,20 Trunk OK

Gig 1/2 With

Switch2

VLAN

10,20 Trunk OK

F0/24 Witch

Switch2

VLAN

10,20 Trunk OK

2960 – 24 TTL Switch 2 Configuration

F0/1 With


F0/2 With


Gig 1/2 With

Switch1

VLAN

10,20 Trunk OK

Gig 1/1 With

Switch3

VLAN

10,20 Trunk OK

F0/24 Witch

Switch1

VLAN

10,20 Trunk Blocked

F0/23 Witch

Switch3

VLAN

10,20 Trunk OK

2960 – 24 TTL Switch 3 Configuration

F0/1 With


F0/2 With


Gig 1/1 With

Switch2

VLAN

10,20 Trunk OK

F0/24 Witch

Switch1

VLAN

10,20 Trunk Blocked

Task


You are the administrator at ComputerNetworkingNotes.com. company have two department sales and management. You

have given three pc for sales and three pc in management. You created two VLAN. VLAN 10 for sales and VLAN20 for

management. For backup purpose you have interconnected switch with one extra connection. You have one router for

intera VLAN communications.

Let's start configuration first assign IP address to all pc's

To assign IP address double click on pc and select ip configurations from desktop tab and give ip address as shown in

table given above

VLAN Trunking Protocol

Configure VTP Server We will first create a VTP Server so it can automatically propagate VLAN information to other switch. Double click on

Switch1 and select CLI. Set hostname to S1 and create VTP domain name example and set password to vinita ( Remember

password is case sensitive ).

Switch 1

Switch>enable

Switch#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Switch(config)#hostname S1

S1(config)#vtp mode server

Device mode already VTP SERVER.

S1(config)#vtp domain example

Changing VTP domain name from NULL to example

S1(config)#vtp password vinita

Setting device VLAN database password to vinita

Configure VTP clients Once you have created a VTP domain. Configure remaining Switch to Client mode.

Switch 2

Switch>enable




S2(config)#vtp mode client

Setting device to VTP CLIENT mode.





S2(config)#

Switch 3

Switch>enable




S3(config)#vtp mode client

Setting device to VTP CLIENT mode.





S3(config)#


Dynamic Trunking Protocol

Configure DTP port All Switch ports remain by default in access mode. Access port can not transfer the trunk frame. Change mode to trunk on

all the port those are used to interconnect the switches

Switch 1

S1(config)#interface fastEthernet 0/24

S1(config-if)#switchport mode trunk

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24,

changed state to down


changed state to up

S1(config-if)#exit

S1(config)#interface gigabitEthernet 1/1


S1(config-if)#exit



%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/2,



changed state to up

S1(config-if)#exit

S1(config)#

Switch 2






changed state to up

S2(config-if)#exit



S2(config-if)#exit






changed state to up

S2(config-if)#exit



S2(config-if)#exit

Switch 3



S3(config-if)#exit



S3(config-if)#exit


Virtual LAN (VLAN)

Create VLAN After VTP server configuration its time to organize VLAN. We need only to create VLAN on VTP server and reset will be

done by VTP Server automatically.

Switch 1

S1(config)#vlan 10

S1(config-vlan)#exit

S1(config)#vlan 20

S1(config-vlan)#exit

S1(config)#

As we have already configure VTP server in our network so we don't need to create VLAN on S2 or S3. We need only to

associate VLAN with port.

Assign VLAN membership Switch 1


S1(config-if)#switchport access vlan 10

S1(config-if)#interface fastEthernet 0/2


Switch 2





Switch 3





Now we have two working vlan. To test connectivity do ping form 10.0.0.2 to 10.0.0.3 and 10.0.0.4. if you get successfully

replay then you have successfully created VLAN and VTP server.

Spanning-Tree Protocol In this configuration STP will block these ports F0/24 of S1 , F0/23 and F0/24 of S2 and F0/24 of S3 to avoid loop at layer to

two. Verify those ports blocked due to STP functions

Verify STP ports Switch 2

S2#show spanning-tree active

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32769

Address 0002.174D.7794

Cost 4

Port 26(GigabitEthernet1/2)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

Address 00D0.FF08.82E1

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 20


Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- ---------------------------

Fa0/1 Desg FWD 19 128.1 P2p

Fa0/2 Desg FWD 19 128.2 P2p

Fa0/23 Desg FWD 19 128.23 P2p

Fa0/24 Altn BLK 19 128.24 P2p

Gi1/1 Desg FWD 4 128.25 P2p

Gi1/2 Root FWD 4 128.26 P2p

[Output is omitted]

S2#

You can test STP protocols status on S1 and S3 also with

show spanning-tree active command

Router on Stick At this point of configuration you have two successfully running VLAN but they will not connect each other. To make intra

VLAN communications we need to configure router . To do this double click on router and select CLI.

Configure intra VLAN Router

Router>enable

Router#configure terminal


Router(config)#interface fastEthernet 0/0

Router(config-if)#no ip address

Router(config-if)#no shutdown

Router(config-if)#exit

Router(config)#interface fastEthernet 0/0.10

Router(config-subif)#encapsulation dot1Q 10

Router(config-subif)#ip address 10.0.0.1 255.0.0.0

Router(config-subif)#exit

Router(config)#interface fastEthernet 0/0.20

Router(config-subif)#encapsulation dot1Q 20

Router(config-subif)#ip address 20.0.0.1 255.0.0.0

Router(config-subif)#exit

To test connectivity between different vlan do ping form any pc to all reaming pc. it should be ping successfully. If you

have error download this configured topology and cross check that where you have committed mistake.

Configured VLAN VTP STP topology

http://computernetworkingnotes.com/images/ccna_certifications/download/switching_basic_configured.pkt


VLAN VTP Server STP DTP command reference sheet

Switch(config)#vlan 10 Creates VLAN 10 and enters VLAN configuration mode for further definitions.

Switch(config-vlan)#name Sales Assigns a name to the VLAN. The length of the name can be from 1 to 32

characters.

Switch(config-vlan)#exit Applies changes, increases the revision number by 1, and returns to global

configuration mode.

Switch(config)#interface

fastethernet 0/1 Moves to interface configuration mode

Switch(config-if)#switchport

mode access Sets the port to access mode

Switch(config-if)#switchport

access vlan 10 Assigns this port to VLAN 10

Switch#show vlan Displays VLAN information

Switch#show vlan brief Displays VLAN information in brief

Switch#show vlan id 10 Displays information about VLAN 10 only

Switch#show vlan name sales Displays information about VLAN named sales only

Switch#show interfaces vlan x Displays interface characteristics for the specified VLAN

Switch#delete flash:vlan.dat

Delete filename [vlan.dat]?

Delete flash:vlan.dat? [confirm]

Switch#

Removes the entire VLAN database from flash.

Make sure there is no space between the colon (:) and the characters vlan.dat.

You can potentially erase the entire contents of the flash with this command if

the syntax is not correct. Make sure you read the output from the switch. If you

need to cancel, press ctrl+c to escape back to privileged mode:

Switch(config)#interface

fastethernet 0/5 Moves to interface configuration mode.

Switch(config-if)#no switchport

access vlan 5 Removes port from VLAN 5 and reassigns it to VLAN 1—the default VLAN.

Switch(config-if)#exit Moves to global configuration mode.

Switch(config)#no vlan 5 Removes VLAN 5 from the VLAN database.

Switch#copy running-config

startupconfig Saves the configuration in NVRAM

Switch(config-if) #switchport

mode trunk Puts the interface into permanent trunking mode and negotiates to convert the


link into a trunk link.

Switch(config)#vtp mode server Changes the switch to VTP server mode.

Switch(config)#vtp mode client Changes the switch to VTP client mode.

Switch(config)#vtp mode

transparent Changes the switch to VTP transparent mode.

Switch(config)#no vtp mode Returns the switch to the default VTP server mode.

Switch(config)#vtp domain

domain-name

Configures the VTP domain name. The name can be from 1 to 32 characters

long.

Switch(config)#vtp password

password Configures a VTP password

.

Switch(config)#vtp pruning Enables VTP pruning

Switch#show vtp status Displays general information about VTP configuration

Switch#show vtp counters Displays the VTP counters for the switch

how to configure vlan

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