Subject: Re: Scaling RSVP-TE end-to-end (was: RSVP-TE and PW)

From: Stewart Bryant <[email-masked]>
Date: Fri, 01 Oct 2004 08:10:09 +0100

[email-masked] wrote:

<snip>

>However, there is ongoing work on hierarchical RSVP-TE, which sounds like it may have the potential to scale RSVP-TE PE-PE using a 2+ layer hierarchy. Using RSVP-TE PE-PE would have several advantages, e.g. end-to-end FRR across the provider network, PE level CAC, and P2P/P2MP OAM and performance monitoring (i.e. no MP2P OAM issues where the source is lost). If we get to this stage then it would make sense to use RSVP-TE for PW signalling as well.
>
>IMO using LDP PW signalling makes sense today, but if hierarchical RSVP-TE delivers then RSVP-TE PW signalling would make sense in the future for some deployments/providers. For this reason I would like to see the RSVP-TE PW signalling approach remain on the table and not be rejected at this time, at least until the capability to scale RSVP-TE PE-PE using hierarchy is proved/disproved.
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So, hierarchical RSVP-TE is the enabling technology, for the use of RSVP-TE
as a PW signalling protocol, but we do not yet know whether it works.

That would suggest that the WG should put RSVP-TE PW setup on the back
burner until we resolve the RSVP-TE performance concerns.

- Stewart