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Notes:
The BGP decision process also contains a additional step after the ASPath step where the routes with the lowest ORIGIN attribute are preferred. We ignore this step and this attribute in this tutorial.
The BGP decision process used by router vendors may change compared to this theoretical description. For real BGP decision processes, see :
http://www.cisco.com/en/US/tech/tk826/tk365/technologies_tech_note09186a0080094431.shtml
http://www.riverstonenet.com/support/bgp/routing-model/index.htm#_Route_Selection_Process
http://www.juniper.net/techpubs/software/junos53/swconfig53-ipv6/html/routing-overview-ipv69.html
http://www.foundrynet.com/services/documentation/ecmg/BGP4.html