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Thursday, October 4, 2012

bgp attribute precedence... quote of the day...

according to chris bryant...
 from:

 http://www.thebryantadvantage.com/CCNPBSCIExamBGPAttributes.htm


BGP looks at path attributes in this order:
  • Highest weight (Cisco-proprietary BGP value)
  • Highest local preference (LOCAL_PREF)
  • Prefer locally originated route.
  • Shortest AS_PATH is preferred.
  • Choose route with lowest origin code. Internal paths are preferred over external paths, and external paths are preferred over paths with an origin of "incomplete".
  • Lowest multi-exit discriminator (MED)
  • External BGP routes preferred over Internal BGP routes.
  • If no external route, select path with lowest IGP cost to the next-hop router for iBGP.
  • Choose most recent route.
  • Choose lowest BGP RID (Router ID).    
  • http://www.trainsignal.com/blog/ccnp-route-exam-help                                                                                                                   

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