Routing Enhancements for GMPLS

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Routing Enhancements for GMPLS

• Jun-Hyun, Moon
• Computer Communications LAB.,
• Kawangwoon University
• imp_at_kw.ac.kr

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Generalized Label

• Label? semantics? abstract identifier? ??? ? ???
  Physical entity (ex, time slot, wavelength,
  switch port)? identifier?? ???
• LSR? OCX? ??
• LSR switching fabric ? OXC wavelength switching
  fabric
• LSP ? Optical channel trail

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Generalized MPLS

• Goal
• A single control domain
• Extended link state ??? ??
• Integrated network topology ??? ??
• Constraint-based routing? ?? traffic engineering
• Dynamic explicit route (LSP, Optical channel
  trail)? ??
• LSP??? protection/restoration ??
• ??? access/metro/core networks? ?? ?? multiple
  switching ??? ??? ?? ????? ?

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Routing? ?? 1

• GMPLS? ?? ??
• ?? link metric? ???? ??? ???? ?
• Constraint? ???? ??(LSP optical channel trail
  ?)? ???? ?
• ??? link state ??? ?? constraint? ??? link state
  ??? distribute? ? ??? ?

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Constraint-based Routing

• ?? metric? ?? constraint? ??? ?? ??? traffic ??
• Constraint? ??
• Link resource attributes (ex. Link bandwidth)
• Link administrative attributes (ex. Resource
  class ? Policy)
• Constraint? ???? ??
• Traffic service requirement? ??
• Load balancing? congestion ??
• Traffic? rerouting? ?? network protection/restorat
  ion ?? ??
• Traffic engineering (TE)? ?? ??? ?

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Constraint-based routing? ?? ?? ??
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IGP(OSPF)? ??

• OSPF ? LSA? ?? ???? link state ??? GMPLS TE link
  TLV? ???? TE link TLV? ??? sub-TLV? ??
• ?? ???? sub-TLVs
• Outgoing/Incoming interfaces identifier
• Link protection type
• Link descriptor
• Shared Risk Link Group (SRLG)
• Maximum LSP bandwidth ?

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??? TE ?? sub-TLVs

• Sub-TLV list of TE Link TLV
• Link type
• Link ID
• Local/Remote interface IP address
• Traffic engineering metric
• Maximum bandwidth
• Resource class/color
• Link mux capability
• Outgoing/Incoming interface identifier
• Maximum LSP bandwidth
• Link protection type
• Link descriptor
• Shared Risk Link Group (SRLG)

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Routing? ?? 2

• Router? label space? ??? OXC? TDM switch? label
  space? ??? ??. ? OXC? ??? ?? TDM channel? ??
  router?? ??? ? ?? label? ??? ?? ??. ???? Label
  space?? ??? ??? ? ????
• Router? ??? ??? ???? ?? ?? ? ??? ?? OXC? ???? TDM
  channel? ???? ??? ?? ? ??? ??? ??? ?

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LSP Hierarchy

• LSP Hierarchy
• Packet switch (PS) LSP Label ? Virtual circuit
• Time Division switch (TDM) LSP Label ? Time
  slot
• Wavelength switch (WS) LSP Label ? Wavelength
• Fiber switch (FS) LSP Label ? Fiber

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Forwarding Adjacency

• ??
• GMPLS Node? LSP? OSPF/IS-IS? Link?? ??? ? ??.? ?
  neighbor node? ???? LSP? neighbor node??
  adjacency? ??? LSP? ?? node ??? adjacency? ??.
  ??? link? Forwarding Adjacency? ???? ?
• Node (LSR)? ??? ??? ? ???? link ? ??? FA link? ??
  ???
• ??? ??? ? GMPLS? signaling? ??? ???? link? FA
  link ??? label binding? ????

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Forwarding Adjacency LSP

• ?? ???? SDH MUX? ??? SDH MUX??? LSP? FA-LSP??
  neighbor node?? ???. ? ???? link? ????? ?? ??
  node?? TE-link ???? flooding ?
• LSR? FA-LSP? ??? link? ???? ??? ??? ? ???

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TE attributes

• Link type
• Link ID(OSPF)
• Router ID of the tail end of FA-LSP
• Local/Remote interface IP address or
  outgoing/incoming interface ID
• Traffic engineering metric
• Maximum/reserved bandwidth
• Resource class/color
• Link Multiplex Capability
• Path information TBD

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Link Multiplex Capability sub-TLV

• OSPF? TE-Link TLV??? Link Multiplex Capability
  sub-TLV? ???? ??
• ? link attribute? ??? link? multiplex/demultiplex?
  ????, ??? ?? ??? mux/demux capability? ??? ???
• Packet-switch capable
• Layer-2 switch capable
• Time-Division capable
• Lamda-switch capable
• Fiber-switch capable

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Routing? ?? 3

• Optical/TDM network? ?? ? ???? node ??? link ??
  ??? ? ???? router ??? link ? ?? ?? ??. ?? ?? ?
  OXC?? fiber ?, ?? wavelength? ?? ?? ?? ? ?? ? ???
  ? ? ??
• ??? ?? ??? link?? ??? ?? Link State Database? ???
  ???? ?? ? ?? ?? ?? ??

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Link Bundling 1

• ??? ??? ?? parallel links? link attributes? ???
  bundled link? attribute?? OSPF? LSA? advertise
  ?
• ??? ??? Link State Database? Link State Protocol?
  scalability ??? ??? ? ??

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Link Bundling 2

• ??? bundled link?? ???? component link? ??? ??
  ??? ??? ?? ??? ?
• Link Types
• Traffic Engineering Metric
• Resource Classes
• Link Multiplexing Capability

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TE attributes

• Link type
• Link ID(OSPF)
• Router ID of the neighbor (or Interface address
  of designated router)
• Local/Remote interface IP address or
  outgoing/incoming interface ID
• Component link ? ??
• Traffic engineering metric component link?
  metric ??
• Maximum Link bandwidth
• Maximum LSP bandwidth? ???? ??
• Maximum reserved bandwidth/Unreserved bandwidth
• Resource class/color
• Maximum LSP bandwidth

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Routing? ?? 4

• Optical/TDM network? ?? ? ???? node ??? link ??
  ??? ? ???? router ??? link ? ?? ?? ??. ?? ?? ?
  OXC?? fiber ?, ?? wavelength? ?? ?? ?? ? ?? ? ???
  ? ? ??
• ??? ?? ??, TDM channel? ??? IP address? ???? ??
  ?? ??? ??? ???? ??? ??

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Unnumbered Link

• Unnumbered Link
• IP ??? ?? ?? link
• LSR? 32-bit identifier? ????, ? ID? ? LSR? ?????
  unique? ??
• ??? link? ltLSR? Router ID, Interface IDgt?
  unique?? ???
• OSPF? TE extension? unnumbered link? ?? ??? ??
• MPLS TE signaling??? ? link? ???

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Routing? ?? 5

• Node? ?? port? neighbor node? ?? port? ???? ????
  ?? ?? link management? ??? ??? ?????
• ?? link? ??? ???? ? ??? ?? ???? ?? channel?? ???
  ???
• Link?? control channel? data channel? ????
  management ?? ?? ???
• ? ?? ?? ??? link? ????? management?? ??? ???

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Link Management Protocol 1

• ? neighbor node ???? link management ??
• Control channel? ??? ??
• Control channel? link ??, ?? ??, ?? ??, label ??,
  topology information? ???
• In-band ?? Out-of-band? ??

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Link Management Protocol 2

• Data channel? ??? ??? ??
• ?? ? cabling error? ??
• Link? label ??? ??
• Link (fiber, channel) ??? ??
• Link property ??? ?? ??
• LMP authentication

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??

• GMPLS? IP network node (router, OXC, TDM switch)?
  ??? control plane?? ???? ?? MPLS-TE ??? routing?
  signaling protocol?
• GMPLS? MPLS? ???? traffic engineering ??? optical
  layer??? ??? ? ??
• GMPLS? ???? ??? IGP? ??? ?? routing???
  ??(enhancements)? ???
• ??, GMPLS? ??? MPLS-TE signaling protocol
  (RSVP-TE, CR-LDP)? ??? ???

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References

• http//www.nigeriancomputersociety.com/contentimag
  es/Generalized Multiprotocol.pdf, GMPLS
• Data Connection Limited, MPLS for Optical Network
• White Rocks Networks, GMPLS A New Way of
  Optical Networking
• RFC 3473, Generalized Multi-Protocol Label
  Switching (GMPLS) Signaling Resource ReserVation
  Protocol-Traffic Engineering (RSVP-TE)
  Extensions. L. Berger, Ed.. January 2003.
• http//www.gmpls.org