Multiple of the same dotq trunks

[EDIT]
My problem is solved. I finally understand how to use vlan trunks on RouterOs in different ways. Thanks to this article:
http://blog.butchevans.com/2010/02/to-tag-or-not-to-tag-that-is-the-question/



Hello,

WHAT I KNOW:
This is what i understand from reading the Mirkotik docs, about creating tagged vs untagged (trunk port vs access port) ports:

  • When i want to create a dot1q trunk port, i have to create one or more vlans under interfaces → vlans and bind it to a physical port.The Mikrotik router automaticly makes that port a dotq trunk, so the vlans will be tagged on that port.

-If i want to create a vlan access port i have to bridge a vlan whith a physical port.

This is my situation (simplified):

I have three vlans: 10, 20, 30. These are vlans my ISP provides (internet, elevision, phone).
The three vlans are tagged on ehter1 which is a dotq trunk, because when creating the vlans ether1 is selected as the interface. On vlan 10 a ppoE session is initiated.

THE PROBLEM:
So i have a working dotq trunk, but now i want another dotq trunk with the same vlans, lets say on ether5 and connect it to a Cisco switch trunk port.

Every example i’ve read so far is always about creating ONE trunk. But i want to create two or maybe more of the same dotq trunk and connect it to other switches/routers.

THE QUESTION:
How to create a two or more dotq trunk ports whith the same vlans tagged on it?

Thanks.