From that BGP table we then run the BGP Best Path Decision Making Algorithm and 1 Best Path is chosen. So let’s see it in an example of what actually happens. Below we have 3 routers ...

But BGP assumes that when a router says it's the best path, it's telling the truth. That gullibility makes it easy for eavesdroppers to fool routers into sending them traffic. Here's how it works.

The FCC today unanimously approved a Notice of Proposed Rulemaking that would require ISPs to prepare confidential reports "detail[ing] their progress and plans for implementing BGP security ...

so when BGP best path is run, …. Voila! New best path! Hence the BGP table version has to increment. Prior to Router30 coming online and advertising 30.30.30.30/32 to Router21, the BGP table ...