RE: I-D ACTION:draft-ietf-ccamp-inter-domain-recovery-analysis-01.txt

["PAPADIMITRIOU Dimitri" <[e-mail]>]

tomonori


reading through this doc still unclear to me why there is no statement
that says (at the end) that the sole issue is due to the fact that
ingress node do not see both protecting and working LSPs (by definition
of diversity) and therefore across that domain, mechanisms are needed:


1. since the problem is only considered in its linear version and
associated protecting and working LSP are are both following the same
sequence, one needs to resolve the intra-domain/intra-AS trap issue (at
the SRLG/node/ link level) and prevent that that two ingress nodes (of
the same domain) do not select the same egress node (of that domain) to
reach the next domain for both protecting and working LSP ?


2. when computation is not simultaneous per domain (independently of
whether sequentially distributed or centralized) and does not result in
strict hops only (implicitly or explcitly), the only thing that remains
possible is to condition the first LSP setup with additional constraints
during its establishment


this would for me streamline this analysis in a protocol independent way
(observe that point 2 is totally independent of whether PCEs are used or
not)


now if a protocol analysis needs to be done it needs to account for call
segments in which case and compared to BRPC the discussion would be
about sequential computation along the downstream or the upstream (or
combination)


thanks,
-d.






> -----Original Message-----
> From: [e-mail] 
> [mailto:[e-mail]] On Behalf Of Tomonori TAKEDA
> Sent: Monday, July 09, 2007 4:04 AM
> To: [e-mail]
> Subject: Fwd: I-D 
> ACTION:draft-ietf-ccamp-inter-domain-recovery-analysis-01.txt 
> 
> Hi,
> 
> A new version of inter-domain recovery analysis I-D have been 
> published.
> 
> Here are major changes:
> - Added text on security considerations section
> - Cleaned up text marked "for further study" (various places)
> - Added a reference to [PCEP-XRO]
> - Enhanced text on computing diverse paths sequentially with 
> confidentiality
>    (Section 5.4.1)
> - Moved "terminology" section into "introduction" section
> - Removed manageability considerations section
> - Polished text
> 
> Authors believe the document is now completed and ready for 
> WG last call.
> 
> Thanks,
> Tomonori
> 
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>  >
>  >A New Internet-Draft is available from the on-line Internet-Drafts
>  >directories.
>  >This draft is a work item of the Common Control and 
> Measurement Plane
>  >Working Group of the IETF.
>  >
>  >	Title		: Analysis of Inter-domain Label 
> Switched Path (LSP) Recovery
>  >	Author(s)	: T. Takeda, et al.
>  >	Filename	: 
> draft-ietf-ccamp-inter-domain-recovery-analysis-01.txt
>  >	Pages		: 23
>  >	Date		: 2007-7-6
>  >
>  >This document analyzes various schemes to realize 
> Multiprotocol Label
>  >   Switching (MPLS) and Generalized MPLS (GMPLS) Label Switched Path
>  >   (LSP) recovery in multi-domain networks based on the existing
>  >   framework for multi-domain LSPs.
>  >
>  >   The main focus for this document is on establishing end-to-end
>  >   diverse Traffic Engineering (TE) LSPs in multi-domain 
> networks. It
>  >   presents various diverse LSP setup schemes based on existing
>  >   functional elements.
>  >
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