[c-nsp] HIDE AS BGP

[jack daniels]

Hi,

Customer---ISP1---ISP2---Internet

using "local-as no-prepend replace-as" (Cisco commands)
configured for ISP1 BGP peering sessions with "Customer" and "ISP2"
would do the trick of hiding ISP1's AS#. ISP1 will pretend to look
like "Customer" to ISP2, and look like "ISP2" to "Customer".
Furthermore, you may use tunneling in ISP1 (e.g. deploy MPLS) and make
it look almost completely transparent to "Customer".

The following conditions apply:
  If the AS_PATH includes both private and public AS numbers, BGP doesn't
remove the private AS numbers. This situation is considered a configuration
error.<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Please advise how to go for this.
Regards
J.Daniels


On 8/10/09, David Freedman <david.freedman at uk.clara.net> wrote:
>
> If the ISP is in the middle , who is the upstream and what does the
> L2VPN do? can you provide a simple diagram?
>
> Dave.
>
> jack daniels wrote:
> > Hi All,
> >
> > We had a requirement in which customer wants that the ISP- AS should not
> be
> > visible when route are advertised to internet via a upstream(L2 VPN
> > solution).
> > Can we use BGP command no-prepend with Replace AS attribute to hide ISP
> AS
> > in internet. ------------
> >
> > Can we peer with customer using local AS which will be private AS.We will
> > use no prepend command along with Replace AS which will replace ISP AS
> with
> > the private AS which is used for Peering.While going out to any
> > international Peer we will remove private AS . On internet only customer
> AS
> > and Peer AS will be visible.
> >
> > Please advise is this solution will work . Also advise if any better
> > solution for this scenario.
> >
> >
> > Thanks and Regards
> > J.Daniels
> > _______________________________________________
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> >
>
>