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OTN physical topology

C. B. OTN physical topology. D. A. F. E. F. OTU2/Och. OTN virtual topology. C. B. D. A. F. E. F. OTU2/Och. ODU1/ODU2. Why virtual topology?. Not congruent with the parent topology (physical or virtual) Different qualities (protection, transparency)

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OTN physical topology

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  1. C B OTN physical topology D A F E F OTU2/Och

  2. OTN virtual topology C B D A F E F OTU2/Och ODU1/ODU2

  3. Why virtual topology? • Not congruent with the parent topology (physical or virtual) • Different qualities (protection, transparency) • Sets limits on resources allowed to be used by intended clients • CP routing should allow an easy way to constrain client ODUs to one or more virtual topologies

  4. OTN virtual topology C B D A F E F OTU2/Och ODU1/ODU2

  5. Why RFC4203 ISCD sub-TLV? • Exists and is used already, designed to be used in multi-layer environments • Technology independent • Sufficient: Switching capability = virt. topology ID : OTN_LO, OTN_HO, OTN_SHO, etc. (maximum 5) • Flexible: allows advertising different signals and LSP bandwidths per role

  6. FA problem • FA links depend on their parents, grand parents, etc. • Complex SRLG configuration is required

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