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Re: [mpls] My question about "static LSP" in TEAS today

"Andrew G. Malis" <agmalis@gmail.com> Wed, 06 April 2016 01:44 UTC

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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Tue, 05 Apr 2016 22:44:12 -0300
Message-ID: <CAA=duU1-kHTCYkAvk9KAR2EMQP8gfDzsdOk9c3Q7uDq2YodKrQ@mail.gmail.com>
To: Adrian Farrel <adrian@olddog.co.uk>
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Subject: Re: [mpls] My question about "static LSP" in TEAS today
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Adrian,

This stirs memories of the good old ATM MIB of yore … we modeled
cross-connects and interfaces, and stitched PVCs (static LSPs as the kids
call them now) by matching labels (VPI/VCI) from one interface to the
connected interface in the next switch.

In the case of SVCs (now dynamic LSPs), we modeled the SVC as a single
network-wide cross-connect.

Cheers,
Andy


On Tue, Apr 5, 2016 at 6:40 PM, Adrian Farrel <adrian@olddog.co.uk> wrote:

> Hi,
>
> I probably wasn't clear in my question. To restate, my question is why is
> the
> static LSP model modelling an end-to-end LSP and not just a single "cross
> connect"? Alternatively, what is the difference between an LSP provisioned
> by a
> control plane, and an LSP provisioned by the management plane? And we
> might even
> bring in "soft permanent LSPs" that are a stitching together of some static
> segments and some dynamic segments.
>
> (You might look at the LSR MIB module that can be used to provision [aka
> model]
> static LSPs.)
>
> When you model maybe you need to think about what is the purpose of
> modelling.
> There are three things going on:
>
> What is the user/application asking for?
> What state is held in the network?
> What does the data plane have?
>
> In this case there is no control plane, but there is still distributed
> state
> installed in the network.
> You said that this is not a data plane model, which is fine.
> So you are modelling either the state in the network or the user's request.
> Now, there may be protocol state (such as parameters of RSVP-TE that exist
> to
> keep the protocol on side) that are special, but the parameters that
> describe
> the state that applies to the LSP are surely identical regardless of how
> the LSP
> was set up. That is, the LSP is a sequence interfaces and labels as well
> as some
> information about reserved resources.
>
> I think I'm rambling. What I am trying to say is that an LSP is an LSP.
>
> Cheers,
> Adrian
>
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