Re: Moving right along ...

[Dimitri Papadimitriou <dimitri.papadimitriou@alcatel.be>]

Hi,

Just some months ago, you asked the same question
but it was between AS's rather nodes. John Drake 
responded to your question at that time... (sorry 
i can't find it back otherwise i would have kindly
refreshed your memory...).

Thanks,
Dimitri.

Zhi-Wei Lin wrote:
> 
> Hi Yanhe,
> 
> Maybe there is some misunderstanding. Node B is strictly not GMPLS. It
> is simply part of the network that made up the "dumb" pipe. And because
> the control plane control channel is separate, A and C can be adjacent
> without ever knowing who B is or that even B existed. From A and C's
> point of view, the network looks like:
> 
>   A ----- C
> 
> Think of the case of how a BGP sees an area. If an area is made up of:
> 
>   A -- B -- C
> 
> and B is internal router, does BGP "see" B?
> 
> Zhi
> 
> Yanhe Fan wrote:
> 
> > Hi, Zhi
> >
> >
> >>For the label value for SONET/SDH or the label description in the
> >>generic draft, the label is defined as directly representing the
> >>"timeslot". Now if I have a control plane controlled transport network
> >>that goes through a ADM that is not control plane controlled, as:
> >>
> >>
> >>+--------+               +--------+               +--------+
> >>|        | ---1--------- |        | ----1-------- |        |
> >>|        | ---2--------- |        | ----2-------- |        |
> >>|  A     | ---3--------- |   B    | ----3-------- |   C    |
> >>|        | ---4--------- |        | ----4-------- |        |
> >>|        | ---5--------- |        | ----5-------- |        |
> >>+--------+               +--------+               +--------+
> >>
> >>Now imagine A and C is part of GMPLS, but B is just a legacy ADM. So at
> >>A you have labels 1,2,3,4,5 (imagine these as in the SUKLM format) and C
> >>has labels 1,2,3,4,5 incoming.
> >>
> >>Now imagine that at B, it actually has a fixed cross-connect that
> >>connects A-1 (A's timeslot #1) to C-2 (C's incoming timeslot #2), A-2 to
> >>C-3, A-3 to C-4, A-4 to C-5, A-5 to C-1.
> >>
> >>Now when A GMPLS sends a message to C, the label it uses is "1".
> >>However, the connection/LSP associated with timeslot "1" is actually the
> >>label of timeslot "2" at C. </z>
> >>
> >
> > In this case, you're trying to use GMPLS to setup an LSP cross a node (B)
> > which can't understand GMPLS.
> >
> > Now imagine A, B and C are all OXCs, can you setup an LSP A-B-C by using
> > GMPLS if B can't understand GMPLS?
> >
> > Now imagine A and B are LSRs, and B is a conventional router (can't
> > understand
> > MPLS), can you setup an LSP A-B-C?
> >
> > Now imagine A, B and C are ATM switches, can you setup a svc if B can't
> > understand PNNI at all?
> >
> > My point is that in order to make you case work, some additional work need
> > to
> > be done besie simply using GMPLS as singnaling protocol, becase some node on
> > the path is not GMPLS speakers. A and C needs the info of time slot aligment
> >
> > between them. This can be done by some configurations, some link management
> > protocls (LMP maybe) etc. As long as A and C have this piece of info,
> > eveything
> > works fine.
> >
> > Yanhe
> >
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