Re: MPLS VPN: Why two lables?

Actually, what you are describing is how Carrier Supporting Carrier is
achieved between the Intermediate BGP nodes. Unfortunately, it is not
practical for All of the nodes to run MP-BGP and also remove the default RT
filter. It would completely defeat the purpose. Is it possible? YES. Is it
practical? No.

Paul

-- 
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
www.micronicstraining.com
> From: Vladimir Osipenko <tiffolk_at_gmail.com>
> Date: Sun, 3 Jul 2011 22:06:11 +0400
> To: Paul Negron <negron.paul_at_gmail.com>
> Cc: marc abel <marcabel_at_gmail.com>, <ccielab_at_groupstudy.com>
> Subject: Re: MPLS VPN: Why two lables?
> 
> If we had no overlapping, we could do MPLS VPN with one label, isn't it?
> 
>> It's like asking why we use 2 encapsulations for QinQ.
> 
> Oh well, yeah it sounds like that =)))
> 
>> http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=04678905
> 
> No, it is closed from public =)
> 
> On 3 July 2011 21:47, Paul Negron <negron.paul_at_gmail.com> wrote:
>> It's just like the ATM days. You need one label to represent the Virtual
>> Path and one label to represent the Virtual Connection.
>> 
>> A Tunnel within a Tunnel.
>> 
> 
>> 
>> Paul
>> --
>> Paul Negron
>> CCIE# 14856 CCSI# 22752
>> Senior Technical Instructor
>> www.micronicstraining.com
>> 
>> 
>> 
>>> From: marc abel <marcabel_at_gmail.com>
>>> Reply-To: marc abel <marcabel_at_gmail.com>
>>> Date: Sun, 3 Jul 2011 12:13:49 -0500
>>> To: Vladimir Osipenko <tiffolk_at_gmail.com>
>>> Cc: <ccielab_at_groupstudy.com>
>>> Subject: Re: MPLS VPN: Why two lables?
>>> 
>>> The biggest efficiency with the labels might be that P routers don't
>>> have to speak BGP, they just need to know the routes to the BGP
>>> speaking PE routers.
>>> 
>>> On Sun, Jul 3, 2011 at 11:44 AM, Vladimir Osipenko <tiffolk_at_gmail.com>
>>> wrote:
>>>> Hi, Guys!
>>>> 
>>>> Despite reading books and articles, I simply don't get it: why we must
>>>> use two lables for MPLS VPN instead of using one label, but without
>>>> PHP?
>>>> 
>>>> Is it because every P router will need to know customer routes? Any
>>>> other reasons?
>>>> 
>>>> 
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>>>> 
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