Re: ISP Policies

["Tulip Rasputin" <tulip_rasputin () yahoo ca>]

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 () vacation karoshi com>
To: "Tulip Rasputin" <tulip_rasputin () yahoo ca>
Cc: <nanog () 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