Dear WG,
As discussed in San Diego, there are still a few requirements stated
in RFC 4657 that PCEP does not satisfy (see Appendix A of the PCEP
ID) for which we'd like your feed-back:
Appendix A
The aim of this section is to list the set of requirements set forth
in [RFC4657] that are not satisfied by the current revision of this
document. This only concerns the requirements listed as MUST
according to [RFC2119].
Here is the list of currently unsatisfied requirements:
o Allow to select/prefer from advertised list of standard objective
functions/options
o Allow to customize objective function/options
o Support "unsynchronized" & "synchronized" objective functions
Comment> The Proposal is to work on this item in the context of a
separate ID that will cover the set of requirements, IGP PCED
extensions and PCEP extensions since these functions are not required
for the base protocol specification.
o Protocol recovery support resynchronization of information &
requests between sender & receiver.
Comment> We can see two potential avenues here:
1) Upon loosing the PCEP session, pending requests are considered as
lost, and the PCC has the initiative to resend the set of pending
requests. The main benefit of such approach is to be extremely simple
and IMO well suited to most of the cases since path computation
requests are not likely to be pending for a long period of time.
2) Specify a set of re-synchronization procedures. We came up with
similar solutions for many other protocols (in very different
contexts and set of requirements) and our experience clearly tells us
that this will likely to be a fairly complex issue. We could see some
benefit in statefull contexts though; thus if such functions is
required for particular context, we would propose not to include in
the base protocol specification and leave it for further should the
WG think that such function will be required.
Thanks for your feed-back.
JP, Jean-Louis et al.
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