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 know they both create a metric of 20.

Source: Understanding OSPF External Route Path Selection

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Timothy

Timothy started his networking career in 2014, working for one of the largest telecommunication operators in Australia. When he's not working, he's obsessing over German Shepherd Dogs.