Blogs

VTP

Protocol VTP

• VTP [VLAN Trunk Protocol]

is a protocol developed by Cisco that is used to manage, create, update,

and delete VLANs (Virtual Local Area Networks) across a network through

switches.

• What is the idea of working the VTP protocol in Switches?

If we have more than one switch device within the network and we want to

create VLANs in each switch, then instead of applying the settings for

creating VLANs in each switch only, we apply them in one switch and

activate the VTP protocol, and thus these networks will be created

automatically on the rest of the switches (it copies these networks via the

trunk port to the rest of the other switches).

• What is VTP mode: There are three types of VTP protocol that the

switch depends on, which are as follows:

1. Server Mode It is the main switch that controls the management of

switches, VLAN management, and sending updates and databases to

all other switches connected to it.

2. Client Mode It is a sub-switch that can only receive traffic. It cannot

manage the network and cannot create a VLAN.

3. Transparent Mode Switches in this mode do not participate in VTP

but can forward VTP advertisements through trunk links. VLANs

created, modified, or deleted on a switch in transparent mode only

affect that specific switch.

VTP pruning is a feature that reduces unnecessary VLAN traffic. When

enabled, VTP pruning ensures that VLAN traffic is only sent to switches that

require it, reducing bandwidth usage and improving network performance.

VTP domain is a collection of switches that share the same VTP domain

name. Switches within the same VTP domain share VLAN information.

Configurations VTP and Trunking and Create VLANs.

SW1

switch-server(config)#

switch-server(config)#int range fa0/1-2

switch-server(config-if-range)#switchport mode trunk

switch-server(config)#vtp domain ahmed

switch-server(config)#vtp password 1234

switch-server(config)#vtp mode server

switch-server(config)#vlan 10

switch-server(config-vlan)#name HR

switch-server(config)#vlan 20

switch-server(config-vlan)#name PR

switch-server(config)#vlan 30

switch-server(config-vlan)#name IT

switch-server(config-vlan)#

SW2

switch-client(config)#

switch-client(config)#vtp domain ahmed

switch-client(config)#vtp password 1234

switch-client(config)#vtp mode client

switch-client#show vlan

SW3

switch-client(config)#

switch-client(config)#vtp domain ahmed

switch-client(config)#vtp password 1234

switch-client(config)#vtp mode client

switch-client#show vlan

LAB2

SW1

switch-server(config)#

switch-server(config)#int f0/1

switch-server(config-if)#switchport mode trunk

switch-server(config)#vtp domain ahmed

switch-server(config)#vtp password 1234

switch-server(config)#vtp mode server

switch-server(config)#

SW2

switch-transparent(config)#

switch-transparent(config)#int range fa0/1-2

switch-transparent(config-if-range)#switch mode trunk

switch-transparent(config)#vtp domain ahmed

switch-transparent(config)#vtp password 1234

switch-transparent(config)#vtp mode transparent

switch-transparent(config)#

SW3

Client1(config)#

Client1(config)#int range fa0/1-2

Client1(config-if-range)#switch mode trunk

Client1(config)#vtp domain ahmed

Client1(config)#vtp password 1234

Client1(config)#vtp mode client

Client1(config)#

SW4

Client2(config)#

Client2(config)#int range fa0/1-2

Client2(config-if-range)#switch mode trunk

Client2(config)#vtp domain ahmed

Client2(config)#vtp password 1234

Client2(config)#vtp mode client

Client2(config)#

➢ Create VLANs in switch-server and show VLANs in switches.

switch-server(config)#

switch-server(config)#vlan 10

switch-server(config-vlan)#name HR

switch-server(config)#vlan 20

switch-server(config-vlan)#name PR

switch-server(config)#vlan 30

switch-server(config-vlan)#name IT

switch-server(config)#