Hi, warriors
I am a newbie with ROUTEROS. Here is my sinario in the pic. I get trouble in configing trunk on my router.
I wanted to get eth3 trunk with vlan1 and vlan48. But how do I config the vlan first? from gui-interface-vlan or from switch-vlan? should I need to create 2 bridges to seperate the two vlans?
Many thanks.

http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Have a read through the examples in this link and you should be well on your way.
At least it will spur more specific questions.