From: CCIE Hunter (cisco.ccie.guru@gmail.com)
Date: Wed Aug 06 2008 - 03:41:28 ART
Hi, as my per understanding...
it use under BGP. let's say you are at provider PE router. And there is your
customer router CE. But your PE is not only connected to one CE. It might be
a few more CE connected to one PE. And you gonna use eBGP peering between yr
PE and CEs. At that moment you have to be split out customer routing
information at PE. So you have to use VRF on PE. So you have to configure
eBGP peering from PE to each customer under specific address-family vrf.
another example is in MPLS vpn environment
there is core MPLS backbone. your 2 PEs connect acorss MPLS backbone and
want to advertise customer routing information each other. At that situation
you have to use BGP address-family vpnv4 between 2 PEs. I believe that is
for the extension of BGP to carry customer prefixes with vpnv4 lables. But
MPLS core don't need to lookup these vpnv4 lables.
There are a few option that can use with address-family eg.like
address-family ipv4,ipv6 or vpnv4.
That's all what I understand. Correct me if i am wrong. for exact theory of
address-family you can find on a lot of cisco press books.
Regards
On Wed, Aug 6, 2008 at 5:39 AM, <yungli2008@gmail.com> wrote:
> Hi Experts
> I am confused in BGP address-family concept. Can anyone guide me to
> understand
> the concept.
> I really appreciate your input
> Advance thanks
> Li
>
>
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