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Other switches connected through trunk links receive the VTP domain information automatically through VTP advertisements.If you are configuring a VTP password, ensure that the same password is set on all switches in the domain that need to be able to exchange VTP information.Switches without a password or with the wrong password reject VTP advertisements.
The off mode was formerly only available with CAT OS.
VLAN Trunking Protocol (VTP) is a Cisco Proprietary which basic aim is to manage all configured VLANs across a switched network.
VTP helps to propagate and maintain VLAN configurations consistency to other switches on the network.
A Switch in VTP Server mode will always actively participate in sending and receiving VTP and synchronising the VTP data file. A Switch in VTP Client mode will always actively participate in VTP data file synchronisation. A switch in VTP v1 Transparent Mode will not send, receive VTP data or participate in file synchronisation.
A switch in VTP v2 Transparent Mode will send, receive VTP data, but doesn’t participate in VTP file synchronisation.
Note that VTP was especially useful when first introduced since configuring VLAN over Token Ring and FDDI interfaces was complex, and it took many years for network administrators to understand VLAN configuration.