At 19:18 22/11/99 -0500, Michael K. Smith wrote:
Or get it from the source:
http://cio.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm#xtocid2375328
-Hank
>Here it is:
>
>1-If NextHop is inaccessible do not consider it.
>2-Prefer the largest Weight.
>3-If same weight prefer largest Local Preference.
>4-If same Local Preference prefer the route that the specified router has
>originated.
>5-If no route was originated prefer the shorter AS path.
>6-If all paths are external prefer the lowest origin code
>(IGP<EGP<INCOMPLETE).
>7-If origin codes are the same prefer the path with the lowest MED.
>8-If path is the same length prefer the External path over Internal.
>9-If IGP synchronization is disabled and only internal path remain prefer
>the path through the closest IGP neighbor.
>10-Prefer the route with the lowest ip address value for BGP router ID.
>
>
>Mike
>
>-----Original Message-----
>From: Jay Stewart [mailto:cosmo@olywa.net]
>Sent: Monday, November 22, 1999 12:16 PM
>To: cisco-nsp@puck.nether.net
>Subject: [nsp] BGP4 Route Selection Criteria
>
>
>Can someone send me the route selection criteria that BGP4 uses to
>determine which route is most preferrable?
>
>>From my understanding, all things being equal, a shorter AS-Path will
>be chosen, regardless of the length of the prefix. In other words, if
>I advertise 10.0.0.0/8 with as path - {AS1 AS2}, and I advertise
>10.0.10.0/24 with as path prepending as such - {AS1 AS2 AS2}, will
>remote routers select the longer AS Path route due to the shorter
>prefix?
>
>Jay Stewart
>Vice President
>Olympia Networking Services - "The Northwest's Premier ISP"
>http://www.olywa.net
>
>
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