Getting on my soapbox, and thinking about the way the light dawned 
for me when I first studied exterior routing, it's terribly difficult 
to plan complex BGP configurations without first writing a clear, and 
preferably formal, definition of policies.

I like to think of policies as formal statements of the business or 
other requirements that define "what problem are you trying to 
solve."  The basic mechanism for describing interdomain routing is 
RPSL:

RFC 2622 Routing Policy Specification Language (RPSL). C. Alaettinoglu, C.
      Villamizar, E. Gerich, D. Kessens, D. Meyer, T. Bates, D. Karrenberg,
      M. Terpstra. June 1999.
RFC 2650 Using RPSL in Practice. D. Meyer, J. Schmitz, C. Orange, M.
      Prior, C. Alaettinoglu. August 1999.

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