Overview
Outlines BGP path selection mechanisms, route preference features, advanced path selection options, and configuration procedures to optimize routing behavior and traffic engineering in BGP networks.
You will learn how BGP determines the best routing paths using its path selection algorithm, how to interpret and influence route preference using attributes and configuration, and how to tune path selection to optimize routing in complex networks.
BGP best path algorithm
Introduces the BGP best path algorithm, summarizing the decision process used by BGP routers to select the optimal route within diverse network environments.
How BGP path selection works
Details how BGP path selection operates, explaining the sequential steps and criteria used to determine the preferred routing path for network traffic.
Order of comparisons and nontransitivity
Explains the order in which BGP route comparisons are made, addressing nontransitivity and its implications for determining the best route among multiple candidates.
Suppressing best path changes
Describes methods used to suppress unnecessary BGP best path changes, reducing routing instability and flapping in dynamic network topologies.
Tuning BGP path selection
Outlines mechanisms for influencing BGP path selection, including cost communities, local preference and weight, multi-exit discriminator, accumulated IGP attributes, and administrative distances, with detailed configuration examples and procedures.
Advanced path selection features
Introduces advanced features for BGP path selection, covering best paths and multipaths, additional paths, and selection using controller-programmed metrics, with benefits, operational details, and configuration steps.