Re: [nsp] BGP4 Route Selection Criteria

From: Dave Bergum (bergum@MR.Net)
Date: Mon Nov 22 1999 - 16:43:48 EST


>>>>> On Mon, 22 Nov 1999 12:15:30 -0800, "Jay Stewart" <cosmo@olywa.net> said:

  Jay> Can someone send me the route selection criteria that BGP4 uses to
  Jay> determine which route is most preferrable?

>> From my understanding, all things being equal, a shorter AS-Path will
  Jay> be chosen, regardless of the length of the prefix. In other words, if
  Jay> I advertise 10.0.0.0/8 with as path - {AS1 AS2}, and I advertise
  Jay> 10.0.10.0/24 with as path prepending as such - {AS1 AS2 AS2}, will
  Jay> remote routers select the longer AS Path route due to the shorter
  Jay> prefix?

Shortest prefix is the first criteria.

Dave.



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