MPLS-TP Control Plane Framework draft-lll-mpls-tp-control-plane-framework-(-1).txt

1
MPLS-TP Control Plane Framework
draft-lll-mpls-tp-control-plane-framework-(-1).t
xt

• Editors
• Loa Andersson ltloa_at_pi.nugt
• Lou Berger ltlberger_at_labn.netgt
• Luyuan Fang ltlufang_at_cisco.comgt

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Draft Objectives

• Provide context for the MPLS-TP control plane
• Based on (and somewhat gated by) MPLS-TP drafts
• Notably requirements, framework and survivability
• Based on existing IETF control plane
• Apply GMPLS/MPLS, PW signaling and routing
  wherever possible
• Draft will not define any protocol extensions
• Will identify gaps, but will not define solution
• Will be covered in future drafts as needed
• Reminder TP does not require a control plane
• Drives which functions are in OAM and which are
  in Control Plane

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Draft Highlights

• PW
• Base mechanisms
• Unmodified (LDP, VCCV, PWE3, etc.)
• Multi-segment
• Based on in-progress PWE3 work
• Redundancy is still TBD
• TE LSPs
• GMPLS signaling and routing
• GMPLS-RSVP, GMPLS-ISIS, GMPLS-OSPF
• P2MP
• Recovery
• Have some open issues
• More on this later

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Why GMPLS?

• Already includes support for
• MPLS labeled data plane
• Unidirectional P2P and P2MP LSPs
• Bidirectional LSPs
• Independent control and data plane topologies
• Recovery (protection restoration)
• Lots of other functionality
• Most common with MPLS, e.g., bundling

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Recovery

• RFC4427 Terminology
• Protection pre-allocated backup resources
• Restoration allocation after failure
• RFC4872 End-to-end recovery
• 11, 11, 1N, Extra traffic
• Reversion, recovery commands
• RFC4873 Segment recovery
• Same as E2E, but for portion of LSP
• RFC4090 FRR
• Allowed for by both 4872 and 4873, but
• May be incompatible with OAM requirements
• This is not a question for the control plane
  framework

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Other topics to be covered

• Part of framework and separate documents
• Applicability statements in framework,
  extensions in separate drafts
• OAM, MEP (hierarchy) configuration control
• Recovery
• E2E, segment
• P2P, P2MP
• CP reference points (E-NNI, I-NNI, UNI)
• MPLS / GMPLS interop
• Diffserv object usage in GMPLS (E-LSPs, L-LSPs)
• Management plane support

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Which signaling?

• OAM or CP?

Function MgmtPlane Control Plane OAM
LSP setup / tear down ? ? X
Signaling restoration (not pre-planned) X ? X
Enabling OAM ? ? X
Fault detection (data plane) X X ?
FIS and Coordinated bidirectional switch X X ?
Reversion X X ?
Protection commands (clear, lockout, forced-switch and manual-switch) ? ? TBD
Loopback control ? TBD TBD
AIS X X ?
Alarm free setup/teardown ? ? TBD
-- possible with CP, but not used in MPLS-TP
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Next steps

• Publish 1st draft
• Likely to include writing assignments to
  volunteers
• Comments?