RE: More comments/questions on DS-TE solution draft

["Naidu, Venkata" <Venkata.Naidu@Marconi.com>]

Francois:

-> >Another unrelated question: As far I understand, the
-> >available bandwidth will get advertised periodically.
-> >Do you think this approach will be sufficient for a
-> >DS-TE network, with lot of LSPs being created and
-> >deleted?
-> 
-> Available bandwidth are certainly advertised periodically. 
-> But they can 
-> also be advertised on various triggers. There has been lots 
-> of useful work 
-> done in teh context of PNNI in particular about what are teh 
-> godd triggers 
-> and the benefits that this extra advertisement offer.
-> Yes, I think combination of periodic and triggered advertisement of 
-> available bandwidth will be sufficient for DSTE as it is 
-> today with regular TE.

   But this periodic advertisements are based on some 
   thresholds (either configurable on per router/interface basis).
   I didn't see any interoperable thresholds defined in
   TE drafts. If routers are configured with different threshold
   values (in between 5% to 10%) then there might be some 
   path setup problems in multi-vendor networks (I can think off)

   One more concern is - "Network/Resource re-optimization". RFC2702 
   Section 5.6.4 Adaptivity Attribute - clearly specifies
   requirements to do re-optimization. But *when and what* to
   re-optimize is left as a local decision. I can think of many
   example scenarios where to re-optimize resources. But I don't
   know the implications in the multi-vendor networks.
 
   Though not related to present discussion, there are just 
   some concerns lurking in my mind for long...
   
Venkata Naidu


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