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Bandwidth reservation per PSC

  • From: "Darek Skalecki" <dareks@nortelnetworks.com>
  • Date: Fri, 16 Jun 2000 12:24:45 -0400
  • Organization: Nortel

Hi,

I have a question with regard to bandwidth availability per PSC and TE
extensions to OSPF/ISIS.

Draft "draft-ietf-mpls-diff-ext-05.txt" talks in APPENDIX B Scenario 2
about constraint based routing being
performed separately for each PSC  where one of the constraints is
availability of bandwidth from the bandwidth
allocated to the relevant PSC.

My question is how TE extensions to OSPF/ISIS support advertizing
bandwidth availability per PSC. The only way I can
think this can be achieved is by assigning different colors/resource
classes to different PSCs thus advertizing bandwidth
availability per PSC simply as bandwidth availability per color/resource
class. Is this correct?.

If it is correct then how serious is the scaling/operational issue at
least within OSPF since N  TE LSAs are needed for  N
PSCs  for every link, implying lots of LSA traffic not to mention
storage within LSDB (which I gather can only store
65536 TE LSAs).

Thanks,

Darek Skalecki
Nortel Networks