[afnog] Private AS in Internet GW

[Mark Tinka]

On Thursday 19 June 2008, Bouchaib Adimi wrote:

> I talk about the both cases a) and b)
> I have :
> 2 IGW with public AS and eBGP sessions  to  ISP s
> and
> 2 PE router connected   to MPLS BB with private AS

Is there any particular reason you are running your PE 
routers with a private ASN?

Your PE routers can share the same public ASN as your other 
routers, as well as continue to provide L3VPN access to 
customers connected to them.

> the question is to make these to PE as  additionnal POI
> (IGW )   suporting also additionnal eBGP with  other ISP 
> in multihomed architecture

This is possible - Internet routes, i.e., routes received 
from other ISP's, will be installed into the global routing 
table.

Routes received from L3VPN customers connected to these 
routers will be installed into a VRF that they belong to.

So generally speaking, you can use the router for both PE 
and regular border/peering functionality, since the routing 
tables are separate.

Cheers,

Mark.
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