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OSPF-TE Extensions for WSON-specific Network Element Constraints draft-peloso-ccamp-wson-ospf-oeo-02. Giovanni Martinelli, Julien Meuric, Pierre Peloso. Rationales for WSON work in ccamp.

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Giovanni Martinelli, Julien Meuric, Pierre Peloso


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OSPF-TE Extensions for WSON-specific Network Element Constraintsdraft-peloso-ccamp-wson-ospf-oeo-02

Giovanni Martinelli, Julien Meuric, Pierre Peloso

rationales for wson work in ccamp
Rationales for WSON work in ccamp

Target:Flooding of information through OSPF-TE to provide a graph to compute both spatial and spectral assignment of a LSP into an all-optical meshed network (WSON).

Issues to solve:Not only flooding of wavelength availability inside links, but also:

  • Switching constraints (spatial and spectral) inside nodes (between links)
  • Description of O-E-O resources inside nodes (for regeneration or conversion purposes)
    • Their availability
    • Their features
    • Their accessibility
changes since 01
Changes since 01
  • Demand from the chairs to merge with drafts:
    • draft-ietf-ccamp-wson-signal-compatibility-ospf
    • draft-zhang-ccamp-rwa-wson-routing-ospf-03

see draft tree next slide

documents tree concerning rwa
Documents tree concerning RWA

draft-ietf-ccamp-rwa-wson-framework-07(gone through last-call)

draft-ietf-ccamp-rwa-info-09

Scope: Connectivity constraints in nodesand labels usage in links

draft-ietf-ccamp-general-constraint-encode-03

draft-zhang-ccamp-general-constraints-ospf-ext-00

draft-ietf-ccamp-rwa-wson-encode-06

Scope: OEO equipments and their usage in RWA

draft-ietf-ccamp-wson-signal-compatibility-ospf-02

draft-peloso-ccamp-wson-ospf-oeo-02

OVERLAPS?

status on works to reach convergence
Status on works to reach convergence
  • First, acknowledge the policy of separation between generic and WSON-specific extensions
  • Second separate items into two categories:
    • What was commonly agreed
      • This stuff ended in draft-zhang-ccamp-general-constraints-ospf-ext-00
    • Items with some technical divergences
      • This stuff is kept separated in current draft and the one presented just before

Third conform to the framework documents and get aligned with the encoding drafts (while not being bonded by their content)

how about mapping on top level tlvs
How about mapping on TOP level TLVs?
  • No Concern about *what* information (well described in general/wson specific encoding) but how we pack them together.
  • Top Level TLVs
  • List of New sub-TLVs:
  • (General + WSON specific)

TE-Link TLV

rfc3036

Wson Sub-TLV

Wson Sub-TLV

Node-Address TLV

rfc5786

Mapping

Wson Sub-TLV

Wson Sub-TLV

Wson Sub-TLV

Resource Block

Attribute TLV

Wson Sub-TLV

  • new

Wson Sub-TLV

Wson Sub-TLV

slide7

B

B

A

C

A

C

D

D

Technical description of the OSPF-TE modifications – previous draft-ietf-ccamp-wson-signal-compatibility-ospf
  • Provide an OSPF-TE layout
    • Have LSA for WDM links with availability of wavelength (dynamic)
    • Have LSA for switching constraints of nodes and OEO resources (static and dynamic)
technical description of the ospf te modifications current draft peloso ccamp wson ospf oeo

B

B

A

C

A

C

OEO pool

OEO pool

OEO pool

D

D

Technical description of the OSPF-TE modifications – current draft-peloso-ccamp-wson-ospf-oeo
  • Provide an OSPF-TE layout that intrinsically separates some static info from some dynamic ones, exploiting the concept of OEO pools
    • Have LSA for WDM links with availability of wavelength (dynamic)
    • Have LSA for switching constraints of nodes (static)
    • Have LSA for OEO resources (static and dynamic)
why introducing a new top level tlv to have oeo specific lsa
Why introducing a new top-level TLV to have OEO specific LSA
  • 1. For the sake of OSPF-TE scalability
    • Smaller objects – independent – more easy to update
  • 2. To reach a certain degree of consistency in each LSA
    • One object (with a single stage of depth) describe the node switching constraints and all that is related
    • Another object (with a single stage of depth) describe the OEO pools features
  • 3. To re-use some TLVs of link LSA that make sense concerning OEO pools
    • SRLGs
    • TE-metric
    • Administrative group
  • 4. To keep the specific status of Node LSA (top-level TLV 5) which holds a specifically static content only – i.e. reference IP address.