Now let’s discuss about VTP role in this topology! Suppose VTP is not running on these switches. One day, your boss decides to add a new department to your office, the Support Department, and you are tasked to add a new SUPPORT VLAN for this department. How will you do that? Well, without VTP you have to go to each switch to enable this new VLAN. Fortunately your office only has 5 floors so you can finish this task in some hours :)
But just imagine if your company was bigger with 100-floor office and some VLANs needed to be added every month! Well, it will surely become a daunting task to add a new VLAN like this. Luckily, Cisco always “thinks big” to create a method for you to just sit at the “Main Sw”, adding your new VLANs and magically, other switches automatically learn about this VLAN, sweet, right? It is not a dream, it is what VTP does for you!
How VTP Works
To make switches exchange their VLAN information with each other, they need to be configured in the same VTP domain. Only switches belonging to the same domain share their VLAN information. When a change is made to the VLAN database, it is propagated to all switches via VTP advertisements.
To maintain domain consistency, only one switch should be allowed to create (or delete, modify) new VLAN. This switch is like the “master” of the whole VTP domain and it is operated in Server mode. This is also the default mode.
Other switches are only allowed to receive and forward updates from the “server” switch. They are operated in Client mode.
Now let’s discuss about VTP role in this topology! Suppose VTP is not running on these switches. One day, your boss decides to add a new department to your office, the Support Department, and you are tasked to add a new SUPPORT VLAN for this department. How will you do that? Well, without VTP you have to go to each switch to enable this new VLAN. Fortunately your office only has 5 floors so you can finish this task in some hours :)But just imagine if your company was bigger with 100-floor office and some VLANs needed to be added every month! Well, it will surely become a daunting task to add a new VLAN like this. Luckily, Cisco always “thinks big” to create a method for you to just sit at the “Main Sw”, adding your new VLANs and magically, other switches automatically learn about this VLAN, sweet, right? It is not a dream, it is what VTP does for you!How VTP WorksTo make switches exchange their VLAN information with each other, they need to be configured in the same VTP domain. Only switches belonging to the same domain share their VLAN information. When a change is made to the VLAN database, it is propagated to all switches via VTP advertisements.To maintain domain consistency, only one switch should be allowed to create (or delete, modify) new VLAN. This switch is like the “master” of the whole VTP domain and it is operated in Server mode. This is also the default mode.
Other switches are only allowed to receive and forward updates from the “server” switch. They are operated in Client mode.
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