ISP Policies

Fri Sep 10 06:31:29 UTC 2004

James,

So this provider would select the path with the longer AS_PATH length and would advertise this one to its peers (if any). I believe then its for the others to decide if they want to take this route or not.

Is my understanding correct?

Thanks,
Rohit

Mtech Comp Sc. 
Institute of Technology
Banaras Hindu University 

----- Original Message ----- 
From: "James" 
To: "Rohit Gupta" 
Cc: 
Sent: Friday, September 10, 2004 11:42 AM
Subject: Re: ISP Policies

 On Fri, Sep 10, 2004 at 11:36:58AM +0530, Rohit Gupta wrote:
 On a related note : Do ISPs ever tweak around with Local Prefs and weights so as to select BGP paths with greater AS PATH length?

 Would it ever make sense for a provider to chose a longer AS PATH length BGP route against a shorter AS PATH length route?

 Yes many do - Prefer your customer routes via customer interfaces, over
 transit and peering interfaces.

 Higher LP over cust interfaces = more bits = more revenue. There is nothing
 wrong with this IMO, considering many of them who do this, also provide
 a community for customers to override this behaviour.
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