Question: how to configure gvrp on cisco ios?
Answer: Enable GVRP globally: COS. set gvrp enable. ...  Configure the port for 802.1Q operation: COS. set trunk mod/port [auto | desirable | on ] dot1q. ...  Configure the port GVRP: COS. set port gvrp mod/port enable. ...  (Optional) Configure the port registration mode: COS.