4 - VTP version 3

VTP3 - ENHANCEMENTS

- Two new modes fix the overwrite problem: Primary and Secondary server
  - Primary server
    - it is the only one authorized to create o delete vlans
    - When you want to make un update promote a server to primary and after the change promote it to secondary
- New advertisments
  - Extended vlans
  - Private vlans
  - MST configuration
- Vtp can now be disabled globally or per link
- A client can't not be promoted to primary server, it has to be promoted to server firt
- You can now turn vtp server off


COMMANDS

- vtp primary mst : promote a switch to primary server in mst
- vtp primary vlan : promote a switch to primary server in mst
- show vtp status
  - Allows check vtp id
  - Allows check vtp id for vlan primary server
  - Allows check vtp id for vlan mst server
- vtp mode server : in vtp version 3 , this is a secondary server an it can't not make changes
- vtp mode off    : turn off vtp in vtp v3

THROUBLESHOOTING

- There can be only one primary server in the domain
- To solve the problem about send vtp pruning request without answer (that disables prunning in the switch allowing all vlans to be in the switch databse)
  you should put "no vtp" at the link level