BGP

BGP Unnumbered uses IPv6 Link-Local addresses for peering, eliminating unique IP assignments on transit links. This simplifies network design. See how to configure this modern approach on Cisco NX-OS and Juniper, enabling one session to carry both IPv4 and IPv6 routes.

At its core, BGP is about establishing and maintaining peering relationships between routers. Before any routing information is exchanged, both routers must progress through a defined sequence of connection states, managed by the BGP state machine.

The Internet, in its magnificent global sprawl, is fundamentally a network of networks. Unlike the neatly contained domains governed by Interior Gateway Protocols (IGPs) such as OSPF or EIGRP, the vast inter-domain landscape requires a routing protocol designed for entirely different challenges. Enter the Border Gateway Protocol (BGP)—the undisputed