BGP – protocol and operation

BGP is an EGP that was introduced in 1984 as v1 to route the network packets by choosing the best routing path. Hence, BGP is also known as the dynamic routing protocol.

So, as time evolved, the internet started growing, and the network traffic eventually started putting a greater load on the communication channels. Hence, the BGP was reframed and multiple versions were introduced. The current version of BGP is v4.

Now, as we know, for routers to communicate outside of their AS, they need to have BGP configured. The local network administrator will not know which AS number they should configure under. So, to solve all the AS and BGP configuration issues, all organizations take the AS configurations from their ISP. Hence, the ISP will put the organization’s network routes under its own AS, making it a single AS to route traffic from the organization to the global internet.

So, as with OSPF, BGP also transfers the data by choosing the...