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Hi Lokesh, This is probably a question for the L3VPN WG :^) However, my understanding is that this is targeted at migration from an OSPF network using dedicated links (not over a VPN). The brief discussion of BGP/OSPF in the CE is in comparison to RFC 4577. Thanks, Acee On Mar 7, 2008, at 2:23 PM, Lokesh Jain wrote: Hi Acee,
Thanks for the reply. I got your point.
But my doubt still remains.
Are we directly migrating from legacy OSPF backbones to BGP/MPLS VPN Backbone with OSPF on PE/CE links or earlier BGP was used on PE/CE links?
If BGP was used, then the complexity/procedures of BGP/IGP interaction (special in this case since we want to redistribute AS-External routes as Inter-area routes) defined by RFC 4577 would already be in existence. We are just moving this interaction from CE to PE to save CE from the extra effort and provide transparency.
Am I correct ?
On Fri, Mar 7, 2008 at 8:23 PM, Acee Lindem < acee at redback.com> wrote: Hi Lokesh,
On Mar 7, 2008, at 5:16 AM, Lokesh Jain wrote:
> Hi All,
>
> In RFC 4577 it states that earlier PE-CE link used BGP but to
> provide certain advantages to customer, OSPF would be a better
> choice between PE-CE link.
> But to do that we have to modify BGP /OSPF interaction so that
> routes are distributed as inter-area routes and not as AS-External
> routes.
>
> My doubt is:
>
> In earlier scenario, CE would be running an instance of BGP and
> some other IGP, say OSPF. In that case also the routes distributed
> in a customer VPN site would be AS-External routes and not inter-
> area routes. How was that handled in previous case? Or is it the
> just the case of moving BGP/OSPF interaction from CE to PE?
>
> Please guide me regarding this. I must be missing on some point here.
The point is for an ISP to provide a transparent Layer 3 VPN service.
If the CE is forced to handle all the complexity of the BGP/IGP
interaction, this is hardly transparent. RFC 4577 mostly succeeds in
this goal and is widely deployed.
Hope this Helps,
Acee
>
>
> --
> ~~~~~~~~~~~~~
> Thanks & Regards,
> ~~~~~~~~~~~~~
> Lokesh Jain
> Senior Software Engineer,
> Samsung India Software Operations Pvt. Ltd.,
> Bagmane Tech Park, C V Raman Nagar,
> Bangalore.
> Mob: 9880611348
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> You always miss 100% of the chances u don't take
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~~~~~~~~~~~~~
Thanks & Regards,
~~~~~~~~~~~~~
Lokesh Jain
Senior Software Engineer,
Samsung India Software Operations Pvt. Ltd.,
Bagmane Tech Park, C V Raman Nagar,
Bangalore.
Mob: 9880611348
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You always miss 100% of the chances u don't take |