I used the INE CCNP Routing & Switching material throughout my studies, and came across a fantastic explanation of Type-1 & Type-2 LSA's, and why Type-2 External LSA's aren't always equal, even though they both create a metric of 20. Source: Understanding OSPF External Route Path Selection
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I came across the OSPF subcommand 'Sham-link' when studying for my CCNP Route exam, and was curious as to what it was. The OSPF sham link provides a logical link between two VRFs. It creates a link that makes the MPLS PE’s participating in the sham link appear as a point to point link within OSPF. These links are able…