BGP analyzing tool

Doug Marschke doug at
Wed Nov 22 06:08:34 UTC 2006

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.





From: Kanagaraj Krishna [mailto:kanagaraj at] 
Sent: Tuesday, November 21, 2006 6:57 PM
To: Doug Marschke
Cc: nanog at
Subject: Re: BGP analyzing tool


Using cli like "sh ip bgp"[Cisco] or "sh route protocol bgp 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.




----- Original Message ----- 

From: Doug Marschke <mailto:doug at>  

To: 'Kanagaraj <mailto:kanagaraj at>  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.


-----Original Message-----
From: owner-nanog at [mailto:owner-nanog at] On Behalf Of
Kanagaraj Krishna
Sent: Tuesday, November 21, 2006 6:27 AM
To: nanog at
Subject: Re: BGP analyzing tool

   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
(local preference, no of AS hops, iBGP vs eBGP etc) would be hard. I need
info to understand why a certain upstream is being more prefered than the 
others. Thanks.


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