Hi Thank you but i have little problem. On Cisco ASR1002 , i have few subinterface gi 0/0/0.200 , gi 0/0/0.201, gi 0/0/0.202 etc on gi 0/0/0 i set mtu to 1522 , and so all subinterface get mtu to 1522 asr is connected on cisco switch 3550 whit mtu 1546 on FastEthernet , and on that switch mikrotik r...