How to configure vlan

PREPARED BY RAVI KUMAR LANKE Page 1
How to Configure VLAN, STP, DTP step by step guide


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

Devices
IP
Address
VLAN
Connected
With
PC0 10.0.0.2 VLAN10
Switch1 on
F0/1
PC1 20.0.0.2 VLAN20
Switch1 on
F0/2
PC2 10.0.0.3 VLAN10
Switch2 on
F0/1
PC3 20.0.0.3 VLAN20
Switch2 on
F0/2
PC4 10.0.0.4 VLAN10
Switch3 on
F0/1
PC5 20.0.0.4 VLAN20
Switch3 on
F0/2
Port
Connected to
VLAN LINK STATUS
F0/1 With
PC0
VLAN10 Access OK
F0/2 With
PC1
VLAN20 Access OK
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
PC0
VLAN10 Access OK
F0/2 With
PC1
VLAN20 Access OK
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
PC0
VLAN10 Access OK
F0/2 With
PC1
VLAN20 Access OK
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

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

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