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When you are setting up VTP, you can choose from three different modes for your switch s configuration:
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Table 13-2 shows the differences between these VTP modes A switch configured in either VTP server or transparent mode can add, modify, and delete VLANs The main difference between these modes is that the configuration changes made Remember the differences to a transparent switch affect only that switch among the VTP modes in Table 13-2 and no other switch in the network A VTP server switch, however, will make the change and then propagate a VTP message concerning the change on all of its trunk ports If a server switch receives a VTP message, it will incorporate the update and forward the message out its remaining trunk ports A transparent switch, on the other hand, ignores VTP messages it will accept them on trunk ports and forward them out its remaining trunk ports, but it will not incorporate the changes in the VTP message in its local VLAN configuration In this sense, transparent switches are like little islands, where changes on a transparent switch affect no one else but the transparent switch itself, and changes on other switches do not affect transparent switches A VTP client switch cannot make changes to its VLAN configuration itself it requires a server switch to tell it about the VLAN changes When a client switch receives a VTP message from a server switch, it incorporates the changes and then floods the VTP message out its remaining trunk ports
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Can add, modify, and delete VLANs Can generate VTP messages Can propagate VTP messages Can accept changes in a VTP message Default VTP mode Saves VLANs to NVRAM Yes Yes Yes Yes Yes Yes
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Description of VTP Modes
13: VLANs and Trunks
Normally, you would set up one switch in server mode and all other switches in client mode Then you would control who could make changes on the server switch However, you should keep in mind that if you make a VLAN configuration mistake on the server switch, this mistake is automatically propagated to all the client switches in your network Imagine that you accidentally deleted a VLAN on your server switch, and this VLAN had 500 devices in it When this occurs, all the switches remove the VLAN from their configuration Given this problem, some administrators don t like to use VTP server and client modes; they prefer to configure all of their switches in transparent mode The problem with transparent mode is that it isn t very scalable; if you need to add a VLAN to your network and your network has 20 switches, you would have to add the VLAN manually to each individual switch, which is a time-consuming process Of course, the advantage of this approach is that if you make a mistake on a transparent switch, the problem is not propagated to other switches: it s localized You could also set up all of your switches in server mode, which is the default setting for VTP As you can see, a wide range of VTP configuration options is available You could even mix and match these options Set up a couple of server switches, and have the remaining switches as clients, or set your switches initially as servers and clients, add all your VLANs on the server switch, allow the clients to acquire this information, and then change all the switches to transparent mode This process allows you to populate your switches configurations easily with a consistent VLAN configuration during the setup process Note that if you don t specify the VTP mode for your switch, it will default to server
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