Studying for my ROUTE exam and had a practice question yesterday that I am kind of stuck on. Here is a picture of what the topology was like....
https://imgur.com/a/7iGH2CN
Every router ID was it's router number 4 times (R1 = 1.1.1.1, R2 = 2.2.2.2, R3 = 3.3.3.3). The issue is the loopback of R3 was not showing up in the routing table of R1. Obviously it is because R3 needs a virtual link to connect it to Area 0. So I did a show run on R3 and there was already a virtual link configured and it was conifigured as "area 10 virtual link 2.2.2.2".
Well I know that is wrong because the area you specify needs to be the transit area. So I then issued the following command.......
R3:
conf t
router ospf 1
area 1 virtual link 2.2.2.2
R2:
conf t
router ospf 1
area 1 virtual link 3.3.3.3
When I did this, a "show ip ospf virtual links" told me that the virtual link was "down". The other incorrect virtual link was still in the config, so I did negated it was a "no" and got rid of it on both routers. After doing this, it made no difference, the new virtual link was still down and I could not get the loopback of R3 to show up in the routing table of R1.
Does anyone have any idea how to troubleshoot a down virutal link? I had never run into this before so was very confused. I also just set this up in GNS3 and had no issues getting it to work.
