Core BGP

This section provides a clear overview of Border Gateway Protocol, commonly known as BGP, and its role as the preferred routing protocol within a service provider core network. It explains how BGP is used to support scalable routing, reliable path selection, and efficient exchange of routing information across large service provider infrastructures. Throughout this section, learners will understand how BGP functions as the routing underlay for carrying customer Layer 2 VPN and Layer 3 VPN traffic across the provider network. The training explains why BGP is commonly used in service provider environments, especially where scalability, policy control, route separation, and multi-customer connectivity are important. The section also introduces how BGP helps service providers manage customer routes, support VPN services, and maintain routing stability across complex network designs. Learners will gain a better understanding of how BGP interacts with the service provider core and how it supports the delivery of L2VPN and L3VPN services. By the end of this section, learners will have a stronger foundation in how BGP operates within service provider networks and why it is a critical protocol for routing customer VPN traffic across modern provider infrastructures.