def change_port_speed(self, instance_id, public, speed):
        if public:
            return self.client.call('Virtual_Guest',
                                    'setPublicNetworkInterfaceSpeed',
                                    speed, id=instance_id)
        else:
            return self.client.call('Virtual_Guest',
                                    'setPrivateNetworkInterfaceSpeed',
                                    speed, id=instance_id)
Allows you to change the port speed of a virtual server's NICs.
dataset/ETHPy150Open softlayer/softlayer-python/SoftLayer/managers/vs.py/VSManager.change_port_speed