Hello Manuel,
> I'm interested on PCE issues, specially those issues related to inter-AS
> PCE.
Welcome aboard.
> In order to provide accurate results, I am trying to use the most
> real network model (at least, as real as possible). So, this is my
> question:
>
> When in PCE WG it is said: "The PCE WG will work on application of this
> model within a single domain or within a small group of domains (where a
> domain is a layer, IGP area or Autonomous System with limited visibility
> from the head-end LSR). At this time, applying this model to large
> groups of domains such as the Internet is not thought to be possible,
> and the PCE WG will not spend energy on that topic".
>
> What is the size we are speaking about? For example, a set of 200
> PCE-based autonomous systems and each one of them having 50 direct
> adjacencies could be a good example? What would be the highest limit
> (for both, number of implied AS and adjacency degree)? I need this
> information in order to design solutions that are scalable enough to be
> operative.
Very good question. And hard to answer precisely.
The intention of the text in the working group charter is to limit the scope
of the PCE work to "connection-oriented" internet technologies (not IP
forwarding), and to solve the problem of selecting path through a known set
of domains rather than selecting the domain level path.
It was considered sensible, when the working group was formed to be cautious
about our scope, and to establish the technology as functional within a
reasonably controlled environment.
Section 5.1.15 of RFC 4657 gives some guidelines.
- number of PCCs (1000/domain)
- number of PCEs (100/domain)
- number of PCCs communicating with a single PCE (1000)
- number of PCEs communicated to by a single PCC (100)
- number of domains (20)
- number of path request messages (average of 10/second/PCE)
- handling bursts of requests (burst of 100/second/PCE within a 10-
second interval).
But you will note that this does not talk about the connectedness of the
domains. Neither the number of peer domains, nor the number of connections
to any peer domain is mentioned. I would expect that these numbers would be
unchanged from normal operation of (say) ASes in the Internet.
I would say that some of the numbers listed above show top-end figures and
one would not necessarily expect, for example, a standard deployment to have
one PCC communication to 100 PCEs.
> Excuse me if it is an off-topic question. I have looked for the answer
> for months but I found nothing related to Interdomain PCE.
Hope that helps.
Adrian
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