PCE Applicability for Inter-Layer MPLS and GMPLS Traffic Engineering draft-oki-pce-inter-layer-app-00.txt

1
PCE Applicability for Inter-Layer MPLS and GMPLS
Traffic Engineering draft-oki-pce-inter-layer-ap
p-00.txt

• Mar. 20, 2006
• Eiji Oki (NTT)
• Jean-Louis Le Roux (France Telecom)
• Adrian Farrel (Old Dog Consulting)

2
Draft overview

• The applicability of the PCE-based path
  computation architecture to inter-layer traffic
  engineering.
• Inter-layer path computation models
• Single PCE inter-layer path computation
• Multiple PCE inter-layer path computation
• Inter-layer path control models
• Higher-layer signaling trigger model
• Cooperation model between PCE and Virtual Network
  Topology Manager (VNTM)
• Text related to the applicability of PCEs for
  inter-layer path computation was moved from the
  inter-layer requirement draft to this
  applicability draft.

3
Inter-layer PCE deployment scenarios

• Single PCE with multi-layer visibility
• Cooperating single-layer PCEs

PCE
High-layer network
Router
Lower-layer network
OXC
High-layer network
Router
PCE_Hi
PCE_Lo
Lower-layer network
OXC
4
Mono-layer path and multi-layer path

• The PCE computes and returns a path to the PCC
  that the PCC can use to build a higher-layer or
  lower-layer LSP. There are two options.
• Mono-layer path
• A path that includes only TE-links from the same
  layer.
• Multi-layer path
• A path that includes TE links from distinct
  layers.

5
Inter-Layer Path Control Models

• Higher-Layer Signaling Trigger Model
• PCE performs inter-layer path computation.
• Higher-layer signaling triggers lower-layer path
  setup.

PCE
Multi-layer path H1-H2-L3-H4-H5
1
2
High-layer network
Egress
Ingress
3
H5
H1
H2
H3
H4
Higher-layer signaling trigger
L1
L2
Lower-layer network
L3
4
6
Inter-Layer Path Control Models (contd)

• Cooperation model between PCE and Virtual Network
  Topology Manager (VNTM)
• VNTM is considered as a functional element.
• PCE performs inter-layer path computation.
• VNTM controls lower-layer path setup.

2
VNT Manager
PCE
Mono-layer path H1-H2-H4-H5
6
1
7
5
3
Egress
Ingress
High-layer network
5
H5
H1
H2
H3
H4
Lower-layer network
L1
L2
L3
4
7
Next step

• Adopt as WG document.
• Existing protocol evaluation to see whether some
  protocol extensions are required to support
  inter-layer path control models.
• Requests for feedback.