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RE: Requesting a LSC LSP across a PCS interface
>
> hi,
>
> > Consider the following situation:
> >
> > Domain A <= | => Domain B <= | => Domain C
> > | |
> > [A1]--PSC--[A2]--PSC--[B1]--LSC--[B2]--LSC--[B4]--PSC--[C1]
> > | | | |
> > |---PSC--[B3]--PSC---|
> >
> >
> > Suppose I want to setup an (PSC) LSP from [A1] to [C1]. In domain B
> > there are two options, the PSC route, or the LSC route. Is
> there a way
> > to request (or hint for) a LSC LSP in domain B for the
> A1-C1 LSP? For
> > example because the quality of the PSC path is deemed
> insufficient from
> > the point of view of domains A and C (e.g. A and C are vey
> high bw LAN
> > enviroments, B a WAN environment).
>
> base on your diagram and assuming symmetric links both nodes
> B1 and B4
> must have a PSC and LSC switching capability so here and as
> provided in
> the diagram i assume the boundary is on the node; however, if
> you mean
> [B1,B4] and [B2,B4] being [PSC,LSC] and [LSC,PSC] resp. then
> B1 and B4
> are simple PSC nodes with LSC interfaces and then the
> boundary would be
> on the interface
>
I envisioned the boundary on the node indeed. But on the interface could
be an option as well.
> now, if all domains are in the same routing area
> - have strict path all along
> - B4 loose hop with explicit indication of incoming interface
>
Okay.
> if all domains not in the same routing area
> - make use of constaint passing by including (or excluding) specific
> switching capability such as to indicate which resource type to
> select/preclude in order to reach the destination B4 (loose hop)
>
So if I understand correctly, the LSP would be something like this:
A1 to C1 via: A2 (strict), B1 (strict), B4 (loose, LSC), C1 (loose)
> hope this helps,
Yes, thanks.
Eduard
> - dimitri.
>
> > Thanks!
> >
> > cheers,
> > Eduard
> >
> >
> >
> > .
> >
>