draft-dachille-inter-area-path-protection-00.txt

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draft-dachille-inter-area-path-protection-00.txt

• A. DAchille dachille_at_coritel.it
• M. Listanti listanti_at_infocom.uniroma1.it
• U. Monaco monaco_at_infocom.uniroma1.it
• F. Ricciato ricciato_at_coritel.it
• V. Sharma v.sharma_at_ieee.org

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Joint Selection Approach overview (1/3)

• Addresses problem of implementing end-to-end
  diverse routing across multi-area networks
• Flexible network model applies to any network
  where
• Network topology can be modeled as a conglomerate
  of interconnected areas (OSPF areas, ASs, optical
  islands)
• Border nodes have
• Complete knowledge of intra-area topology
• Summarized info. of inter-area connectivity
  (list of inter-area paths)

ABR1
ABR3
Area 1
Area 2
Area 3
ABR2
ABR4
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Joint Selection Approach overview (2/3)

• New RSVP-TE object, Associated Route Object
  (ARO), to support the simultaneous computation of
  the disjoint LSPs
• Records path of disjoint LSP during the signaling
  of the first LSP
• The format of the sub-objects included in ARO is
  shown below

RSVP-TE signaling for JSA
ARO Sub-objects
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Joint Selection Approach overview (3/3)

• Advantages of the disjoint path computation
  scheme are
• Independence from disjoint paths computation
  algo./method
• E.g. Bhandari, Surballe, others,
• No extra signaling/routing load to achieve the
  objective
• Generic method of communicating alternate path
  info.
• Usable in other contexts
• Robustness against trapping topology problem
• Better performance on optimal path selection

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Relation with other works (1/2)
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Relation with other works (2/2)
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Next Actions

• Logically separate disjoint path computation
  element from the area/AS border node
• JSA could be directly extended to support area/AS
  centralized or distributed path computation
  mechanisms
• Enhance JSA to obtain better performances and/or
  improved flexibility
• Perhaps integrate the XRO and ARO functionalities
  to provide a common way of achieving a diverse
  set of required inter-area/AS functions
• Obtain further WG feedback/inputs
• Progress the document to a WG document