- Why are a019-a020 and b019-b020 links in area 1 and for which reasons should they remain that way (if there are any)?
------------------------it is a trunk link, all vlans ip are in area1(a019-a020) or area2(b019-b020),so it is area1 or 2....
Can I add another vlan for area0 and enable it in this trunk ? so it can be in area1 and area 0(a019-a020)
- What is the role of router1, router4, router5 and router6? Are they also part of ospf, if so of which area?
---------------------------router1 and router4 are in area1 and 5.6 in area2,they are the ASBR.
I have one question, in the current config, if a019-b019 is down, will router1/4 be able to reach router5/6.It seems it still can reach....