Re: [ANCP] Question about the ANCP high-level architecture

[stefaan.de_cnodder at alcatel.be]

Hi Kais,

see below...

Kais Belgaied wrote:

> Folks,
>
> My question is regarding the following picture of the high level ANCP
> architecture:
>
>
>                                                +--------+
>                                                | Policy |
>                                                | Server |
>                                                +--------+
>                                                     |
>                                                     |
>   +-----+   +-----+   +--------+                 +-----+   +----------+
>   | CPE |---| HGW |---|        |                 |     |   |          |
>   +-----+   +-----+   | Access |   +---------+   |     |   | Regional |
>                       |  Node  |---| Aggreg. |---| NAS |---| Network  |
>   +-----+   +-----+   |        |   |  Node   |   |     |   |          |
>   | CPE |---| HGW |---|        |   +---------+   |     |   |          |
>   +-----+   +-----+   +--------+                 +-----+   +----------+
>
>
> The policy server is attached to the NAS only.
>
> A couple of observations about the AN:
> . it is shared between multiple HGWs that don't know/trust each other
> . it is the first candidate for enforcing link sharing policies (e.g. 
> bandwidth
>  allocation) between subscribers attached to those HGWs

do you mean that bandwidth can be shared between 2 subscribers? This can 
also be done by the NAS Policy server I would think. Note that the main 
focus of the WG is DSL, and sharing bandwidth in DSL is rather difficult.

> Such policy is applicable to HGWs connected to the same AN.
> There may be other policy information still live in the NAS policy server.
> The picture could look more like:
>
>                        +--------+              +--------+
>                        |   AN   |              |  NAS   |
>                        | Policy |              | Policy |
>                        | Server |              | Server |
>                        +--------+              +--------+
>                            |                        |
>                            |                        |
>   +-----+   +-----+   +--------+                 +-----+   +----------+
>   | CPE |---| HGW |---|        |                 |     |   |          |
>   +-----+   +-----+   | Access |   +---------+   |     |   | Regional |
>                       |  Node  |---| Aggreg. |---| NAS |---| Network  |
>   +-----+   +-----+   |        |   |  Node   |   |     |   |          |
>   | CPE |---| HGW |---|        |   +---------+   |     |   |          |
>   +-----+   +-----+   +--------+                 +-----+   +----------+
>
> comments?

As mentioned during the meeting, the interaction with the policy server 
has to be further detailed. I do not say that the above architecture is 
invalid but I do not see how it relates to the current framework of 
ANCP. The NAS policy server gives all subscriber information to the NAS, 
which enforces the policies are gives them to the AN via ANCP. If you 
have 2 policy servers, then you must also take care of all possible 
interactions, e.g., AN policy server says that the bandwidth is x Mbps 
while the NAS says y Mbps.

Maybe an Element Management system to the AN can be added because that 
one has some interaction with ANCP.

regards,
Stefaan


>     Kais
>
>
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