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ISPs usually have most of their routers
running BGP, with some leaf nodes running IGP. On the other hand, most
customers have few routers running BGP and the majority of their
internal IGP routers running defaults toward the BGP routers. In these
scenarios, it is important to have the BGP policies go hand-in-hand
with routing inside the AS. Conflicting policies might result in
routing loops if the AS's physical layout does not complement the
logical layout. This chapter discusses the interaction of BGP routes
with IGPs inside the AS and presents the options of controlling routes
via policy routing.
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