From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Wed Jul 10 2002 - 08:14:20 GMT-3
How's that ?
That takes for granted that for being a transit AS you'll be traveling
through iBGP. That's not always the case.
In a NAP, you may have one router with lots of neighbour ASs, and there
you might become transit even though you keep synch on.
Nick Shah wrote:
>
> This is a *perfect* answer in a production world.
>
> But in a controlled/lab environment, where mostly one router belongs to one
> AS, it may not be practically possible. That leaves only prefix filtering by
> no-community and/or all forms of prefix filters (distribute lists etc.)
>
> rgds
> Nick
>
> Message -----
> From: "Tom Larus" <tlarus@cox.net>
> To: "Jay Hennigan" <jay@west.net>; "John White" <jan_white7@hotmail.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Wednesday, July 10, 2002 12:13 AM
> Subject: Re: As Transit
>
> > This is probably not what they are looking for, but if you leave synch on,
> > and do not redistribute bgp routes into you igp, you will definitely NOT
> > become a transit AS.
> >
> > Is the real answer to set all your incoming bgp routes to no-export?
> >
> > ---- Original Message -----
> > From: "Jay Hennigan" <jay@west.net>
> > To: "John White" <jan_white7@hotmail.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Tuesday, July 09, 2002 12:39 AM
> > Subject: Re: As Transit
> >
> >
> > > On Tue, 9 Jul 2002, John White wrote:
> > >
> > > > Hi Guys,
> > > > I'm doing Cisco Aset lab.One of question is to prevent our AS from
> > becoming
> > > > Transit AS, but your not allowed to use AS path filtering.
> > > > Learning routes from outside shuould be still possible.
> > > > Somehow I can't think of anything else. Distribution list?Community
> > list?
> > >
> > > Hint:
> > >
> > > Look at the well-known community attributes.
> > >
> > > --
> > > Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net
> > > NetLojix Communications, Inc. - http://www.netlojix.com/
> > > WestNet: Connecting you to the planet. 805 884-6323
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