Chapter 6. Tuning BGP Capabilities

This chapter covers the following key topics:

  • Building peer sessions— A walk-through of the negotiation process between BGP and its neighbors.

  • Sources of routing updates— The source and method by which routes are injected into BGP have implications for the accuracy and stability of routing information.

  • Overlapping protocols: backdoors— When alternative routes into and out of a network are offered by overlapping protocols, a method of ranking them by preference is available.

  • The routing process simplified— The decision model by which BGP receives, filters, selects for usage, and advertises routes, as a continuous process.

  • Controlling BGP routes— At the core of BGP is a collection of attributes that administrators can apply to control routing according to their networks' needs.

  • Route filtering and attribute manipulation— An example-oriented, systematic look at how BGP permits or denies routes, applies filters, and manipulates attributes to define the set of routing updates that enter and exit an autonomous system.

  • BGP-4 aggregation— Several specific scenarios involving different aggregation choices and how BGP-4 accommodates them.

Up to this point, this book has been concerned primarily with general definitions of interior and exterior gateway protocols and an overview of their respective and interconnected tasks. The Border Gateway Protocol (BGP) was also presented from the technical perspective of its functional elements. With this chapter, you will begin to consider more practical implementation details for BGP as part of the overall design problem in building reliable Internet connectivity. This chapter examines specific attributes of BGP and how they are applied individually and together to address this design problem. Although the terminology, attributes, and details of this chapter are specific to BGP, the general concepts and problems raised are pertinent to routing architecture design, regardless of what specific protocols are being utilized.

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