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

[Anthony D Cennami]

Correct.

The routes would be advertised with significant summarization _into_ the
provider, however, they would not be accepted on either end of the PE-CE
session; only the CE-CE session would have full visibility of the network.


> 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.
>
> Of course, you can tunnel the CE-CE traffic with GRE, but I don't
> think that's what you have got in mind...
>
> --
>
> Regards, Per Carlson
>
> "He's just a politician trying to save both his faces ..."
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-- 
Anthony D Cennami
Managing Partner
neuPATH, LLC
p: (212) 380-1891 x 706
f: (212) 380-1891
acennami at neupath.com