I don't know of any tool, but it seems like you should be able to get a show route detail about, write a script to choose inactive reasons and sort based off that. Doug _____ From: Kanagaraj Krishna [mailto:kanagaraj@aims.com.my] Sent: Tuesday, November 21, 2006 6:57 PM To: Doug Marschke Cc: nanog@merit.edu Subject: Re: BGP analyzing tool Using cli like "sh ip bgp xxx.xxx.xxx.xxx"[Cisco] or "sh route protocol bgp xxx.xxx.xxx.xxx detail" [Juniper] would be able to show me details for specific destinations. What i need is a software to get all the data from a routers routing table, analyze the best path and summarize the reason why its being chosen based on the BGP algorithm (local pref, no. of hops, MED, etc). That would show the big picture of why a certain upstream is more prefered than the other. Thanks. Regards, Kana ----- Original Message ----- From: Doug Marschke <mailto:doug@ipath.net> To: 'Kanagaraj <mailto:kanagaraj@aims.com.my> Krishna' Sent: Wednesday, November 22, 2006 10:09 AM Subject: RE: BGP analyzing tool What kind of router? A juniper will show you this with a show route detail. Doug -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Kanagaraj Krishna Sent: Tuesday, November 21, 2006 6:27 AM To: nanog@merit.edu Subject: Re: BGP analyzing tool Hi, Are there any available BGP analyzing tool that can be used to identify details on best chosen path based on the BGP algorithm? NTOP can capture the traffic info, but to analyze each destination to find the reason for selection (local preference, no of AS hops, iBGP vs eBGP etc) would be hard. I need this info to understand why a certain upstream is being more prefered than the others. Thanks. Regards, Kana