ISP Policies

Thu Sep 9 04:45:04 UTC 2004

So can you give me an example of why and when would an ISP *not* want its 
traffic to flow via some other AS(es). Is it a normal policy to have, and do 
most of the ISPs have such policies in place?

Thanks,
Tulip

----- Original Message ----- 
From: <bmanning at vacation.karoshi.com>
To: "Tulip Rasputin" <tulip_rasputin at yahoo.ca>
Cc: <nanog at merit.edu>
Sent: Thursday, September 09, 2004 10:07 AM
Subject: Re: ISP Policies

>
> yes.
>
>
> On Thu, Sep 09, 2004 at 09:58:52AM +0530, Tulip Rasputin wrote:
>>
>> Hi,
>>
>> I have a general policy question.
>>
>> Do the ISPs ever look for some particular AS number in the BGP AS_PATH 
>> and
>> then decide what action/preference/priority they need to take/give based 
>> on
>> the AS number(s) present in the BGP AS_PATH_SEQ/SET? For instance, does 
>> it
>> happen that an ISP receives some BGP paths, but because of some 
>> political,
>> social, economical, DOS attack, etc. reasons decides that it doesn't want
>> to accept this path because some particular AS number is present in the 
>> BGP
>> UPDATE.
>>
>> Basically, it doesn't want *its* traffic to flow via that particular AS
>> number(s).
>>
>> Or, if there is a mutual disagreement between two ISPs, and one doesn't
>> want his traffic to traverse the other's AS number.
>>
>> Does this sort of thing ever happen? Are such restrictive policies normal
>> in the ISP/IX scenarios?
>>
>> Thanks,
>> Tulip
>> 