Re: [OSPF] RFC 4577 Query

[Acee Lindem <acee at redback.com>]

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
> -----------------------------------------------------
> You always miss 100% of the chances u don't take
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