Troubleshooting OSPF - LAB 1

Here is a quick lab I put together to really test your knowledge about OSPF Path selection and some of the hidden rules behind the path selection.

Simple topology below.

Objective: 

• R3 should choose R2 over Gi1.23 to reach R1 loopback 150.1.1.1/32. Imagine that this is a 40Gbit link where as Gi1.13 is just a 100Mb link. Currently R3 is choosing Gi1.13 to reach R1 loopback 150.1.1.1/32. 

Restrictions:

• Do not configure any new routing protocols.
• Do not change Area numbers.
• Do not create any NEW areas. 
• Do not change OSPF cost values
• R3 should choose R1 with OSPF as the routing protocol so no STATIC routes etc. 

Configuration excerpts below so you can configure it in your lab.