Can I rebuild an OSPF topology using *only* the LSAs in the LSDB?

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OSPF Routers share LSAs with each other, and those LSAs are used by each router to rebuild the entire OSPF topology.

So in theory, all anyone would need to rebuild an OSPF topology is a look inside each LSA. But is that really enough to map out an entire topology?

That was the challenge I faced in this video that I recently published:

https://www.youtube.com/watch?v=6EIdx1j6FMw

The video features Jeremy, of Jeremy's IT lab, who built an OSPF topology for me without ever letting me see it. He then showed me various show ip ospf database commands and using only those I was tasked with drawing out the topology he built, just like a Router would.

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Posted: 1 year ago
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