BGP Fundamentals
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BGP (Border Gateway Protocol) is the protocol of the Internet. BGP is designed to handle hundreds of thousands of routes unlike our IGP counterparts. Currently there are roughly 635 000 IPv4 routes on the internet. Could you imagine an IGP like OSPF running on an Internet router containing 635k routes? It would die if a link flapped. This is why BGP was created. Actually, there was an Internet routing protocol called EGP (Exterior Gateway Protocol) which was BGP's predecessor however it was replaced by BGP a long time ago.