Sunday, September 2, 2018

VLAN Trunking protoco ( VTP )

A switch can belong to only one VTP domain, in addition to sharing VLAN information with other switches in the domain. Switches in diffeent VTP domain, do not share VTP information.

Switches in a VTP domain advertise several attributes to their domain neighbors. Each advertisement contains information about the VTP management domain, VTP revision number, known VLANs, and specific VLAN parameters. When VLAN is added to a switch in management domain, other switches are notified of new VLAN through VTP advertisements. In this way, all switches in a domain can prepare to receive traffic on their trunk ports using the new VLAN.



VTP Modes-Every switch is server mode by default. Server mode is  the default VTP mode and allows VLANs to be created and deleted 

VTP modes determines how the switch can process and advertises VTP information. you can use following modes.

Server Mode-In this mode, VTP servers have full control over VLAN creation and modification for their domains.

Client Mode- VTP clients do not allow the administrator to create, change, or delete any VLANs. Instead, they listen to VTP advertisementss from other switches and modify their VLAN configurations accordingly. this is also called passive lstion mode. received information is always forwarded on it's truck link to neighboring switches in the domain.

Transparent Mode-VTP transparent sw3itches do not participate in VTP. it can create and delet VLANS that are lcoal only to itself. these VLAN changes are not propagated to any other switch .
It does not advertise it's own VLAN configuration and, also switch does not synchronize it's VLAN database with received advertisement


New Switch Adding in the existing infrastructure  or VTP domain-

Since by default, every switch operates in VTP server mode, it hears a VTP summary advertisement on a trunk port from any other switch, it automatically learns the VTP domain name, VLANs, and configuration revision numbers This makes it easy to bring up a new switch in an existing VTP domain.

You just need to verify all these information by below commands
Switch # show vtp status


Configuratin a VTP management domain for newly setup - 

If a switch is the first one on the network, the management domain must be created.

switch(config)# vtp domain <domain name>












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