[c-nsp] VPNv4 - Multiple eBGP (CE->PE; CE->CE multihop) - Validation

[Kristofer Sigurdsson]

Hi,

On mán, 2005-07-11 at 09:42 +0200, Per Carlson wrote:
> On Fri, Jul 08, 2005 at 12:54:57PM -0400, Anthony D Cennami wrote:
> > CE->PE ---- PE->CE eBGP to VPN provider.  Filtered announcement,
> > advertising only Lo0 of each CE device to the PE/provider.
> > 
> > CE->CE  eBGP multi-hop via Lo0 advertising CE routes between each CE peer.
> > 
> > All relationships are eBGP; Client sites #1 and #2 use different AS.
> > 
> > Thus, CE routes would be "invisible" to provider/backbone, instead, only
> > CE routes would be visible, allowing eBGP multihop relationship across the
> > network.
> 
> I think you have forgotten one important aspect here, forwarding
> through the VPN provider network. If you only advertises the Lo0
> interface on each CE, the provider does only know those IP-adresses
> and can only forward traffic to Lo0's.

This could be done using the "Carrier Supporting Carrier" model.

A quick cisco.com search for "Carrier Supporting Carrier MPLS" gives me 
this:
http://www.cisco.com/en/US/products/sw/netmgtsw/ps4748/products_user_guide_chapter09186a0080353a4d.html

...among other results.

Hope this helps.

-- 
Kristófer Sigurðsson           Tel: +354 414 1600
Netrekstur/Network Operations  IP Fjarskipti ehf.