VIRTUAL TRUNKING PROTOCOL MODE EXPLANATION IN EASY WAY

1. Client Mode
2. Server Mode
3. Transperent Mode

1) Client Mode

- Can not create or change or delete VLANS.

- Send and forward advertisement

- Synchronise

2) Server Mode

- Create VLAN

- Modify VLAN

- Delete VLAN

- Send & forward advertisement

- Synchronise

3) Transperent Mode

- Create, Modify and Delete local VLANS only

- Forward Advertisement

Default mode is always Server Mode, So you have to change to Client or Transperent mode as per your requirement.