'''PATHLET ROUTING '''
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     1. Scalability of routing system
     2. Multipath Routing :
     Solution to two important deficiencies of BGP: 
      * poor reliability
      * Sub-optimal path quality, in terms of metrics such as latency, throughput, or loss rate
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 Pathlet routing's data plane can emulate the routing policies of BGP, 
 loose and strict source routing, and 
 three recent multipath proposals: NIRA, MIRO, and LISP 
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 THREE KEY IDEAS
 1. path-lets and vnodes are highly flexible building blocks
 2. AS whose policies have only local constraints can represent its policies using a small number of pathlets, 
   leading to small FIBs and many allowed paths
 3. pathlet routing does not impose a global requirement on what style of policy is used
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