There are many books that detail the operation of routing protocols such as OSPF or BGP, but none that place the protocols in the context of routing policies and the real world of ISP peering and customer relationships. Once realistic expectations of packet routing behavior is added to the basic routing protocols, routing policies are unavoidable. Fortunately, Walter Goralski sheds some much-needed light on this intricate protocol-policy relationship by offering two important benefits where other routing books fall short. First, he does not assume a Cisco-centric world. Goralski covers both Juniper Networks and Cisco, and touches on other vendor implementations. Second, he focuses on real routing policy situations?the way routing domains actually work?instead of just giving the protocol anatomy. The emphasis throughout this book is on routing policy and, in particular, those features of the routing policy that add to, delete from, or modify the routing information normally shared by routers when no routing policies are in place.
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