The MPLS-OPS Archive

[Rajiv Asati <rajiva@cisco.com>]

Maher,

>This implementation I assume on BGP PE to CE links right?

Yes.

Cheers,
Rajiv

At 12:34 AM 1/22/2005, Maher Adib wrote:
>Hi there,
>
>Rajiv Asati wrote:
> >> > If the customer service
> >> > provider's sites have different AS numbers, then the BGP/MPLS VPN
> >> transit
> >> > service provider supports multi-AS operations."
> >> > AFAIK, this refers to multi-carrier , interprovider(inter-AS?)
> >> MPLS/BGP VPN's .....
> >
> >
> > Not necessarily. If the motive is to provide the transport service, then
> > CsC is still the way to go.
> > Whether the ASN values are the same or not usually has no relevance to
> > the above conclusion.
>
>Yeap.I go agress about this. Even public or private ASN can be done
>without overlapping ip addresses :)
>
> > And this is no different from the usual VPN service. Think of it as the
> > following -
> >  1) If the VPN customer has the same ASN in all the sites, then the SP
> > need to use "as-override"
> >      to facilitate the CE routes being accepted at the other CEs.
> >  2) If the VPN customer has unique ASN in each site, then the SP doesn't
> > need to use
> >      any special knob, since BGP (at the CE) would accept the remote
> > site routes just fine.
>
>This implementation I assume on BGP PE to CE links right?
>
> > Now, the motive has changed. You want to service the same VPN customer
> > which has sites spread across two SPs and want seamless VPN
> > connectivity. Hence the need for Inter-AS, in which two SPs peer with
> > each other at one or two locations. Of course, this requires agreements
> > regarding number of VPN routes, amount of traffic, SLA, QoS etc to be
> > negotiated.
> >
> > Important to note that we are referring to "tie-up" -> Partnership here.
>
>Lots of things involved here when doing Inter-AS.
>
> > But keep in mind that if the same VPN customer is already serviced by
> > two different SPs, then Inter-AS is only way to provide seamless VPN
> > connectivity. CsC helps to provide the transport service to another
> > (baby) SP, hence the VPN customer of baby SP will not be able to talk to
> > the VPN customer of parent SP (without some heavy lifting and hair loss).
> >
>Holding two or more SP..as the parent acting as a transit...
>
>regards,
>
>maher

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