draft-ietf-pce-stateful-hpce-00.txt   draft-ietf-pce-stateful-hpce-01.txt 
PCE Working Group D. Dhody PCE Working Group D. Dhody
Internet-Draft Y. Lee Internet-Draft Y. Lee
Intended status: Informational Huawei Technologies Intended status: Informational Huawei Technologies
Expires: December 18, 2017 D. Ceccarelli Expires: December 31, 2017 D. Ceccarelli
Ericsson Ericsson
J. Shin J. Shin
SK Telecom SK Telecom
D. King D. King
Lancaster University Lancaster University
O. Gonzalez de Dios O. Gonzalez de Dios
Telefonica I+D Telefonica I+D
June 16, 2017 June 29, 2017
Hierarchical Stateful Path Computation Element (PCE). Hierarchical Stateful Path Computation Element (PCE).
draft-ietf-pce-stateful-hpce-00 draft-ietf-pce-stateful-hpce-01
Abstract Abstract
A Stateful Path Computation Element (PCE) maintains information on A Stateful Path Computation Element (PCE) maintains information on
the current network state, including: computed Label Switched Path the current network state, including: computed Label Switched Path
(LSPs), reserved resources within the network, and pending path (LSPs), reserved resources within the network, and pending path
computation requests. This information may then be considered when computation requests. This information may then be considered when
computing new traffic engineered LSPs, and for associated computing new traffic engineered LSPs, and for associated
and dependent LSPs, received from Path Computation Clients (PCCs). and dependent LSPs, received from Path Computation Clients (PCCs).
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(PCE5). (PCE5).
Additionally: Additionally:
(20) Once P-PCE receives report of each per-domain LSP, it (20) Once P-PCE receives report of each per-domain LSP, it
should use some stitching mechanism, which is out of scope of should use some stitching mechanism, which is out of scope of
this document. In this step, P-PCE (PCE5) could also initiate this document. In this step, P-PCE (PCE5) could also initiate
an E2E LSP (S-D) by sending the PCInitiate message to Ingress an E2E LSP (S-D) by sending the PCInitiate message to Ingress
C-PCE (PCE1). C-PCE (PCE1).
A suitable stitching mechanism would be used to stitch these per
domain LSPs. One such mechanism is described in [I-D.lee-pce-lsp-
stitching-hpce], where PCEP is extended to support stitching in
stateful H-PCE context. Section 2.1 of [I-D.lee-pce-lsp-stitching-
hpce] updates the procedure described in this section to handle the
stitching via PCEP stateful H-PCE extension for Stitching Label.
4. Other Considerations 4. Other Considerations
4.1. Applicability to Inter-Layer 4.1. Applicability to Inter-Layer
[RFC5623] describes a framework for applying the PCE-based [RFC5623] describes a framework for applying the PCE-based
architecture to inter-layer (G)MPLS traffic engineering. The H-PCE architecture to inter-layer (G)MPLS traffic engineering. The H-PCE
Stateful architecture with stateful P-PCE coordinating with the Stateful architecture with stateful P-PCE coordinating with the
stateful C-PCEs of higher and lower layer is shown in the figure stateful C-PCEs of higher and lower layer is shown in the figure
below. below.
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[RFC6805] King, D., Ed. and A. Farrel, Ed., "The Application of the [RFC6805] King, D., Ed. and A. Farrel, Ed., "The Application of the
Path Computation Element Architecture to the Determination Path Computation Element Architecture to the Determination
of a Sequence of Domains in MPLS and GMPLS", RFC 6805, DOI of a Sequence of Domains in MPLS and GMPLS", RFC 6805, DOI
10.17487/RFC6805, November 2012, 10.17487/RFC6805, November 2012,
<http://www.rfc-editor.org/info/rfc6805>. <http://www.rfc-editor.org/info/rfc6805>.
[I-D.ietf-pce-stateful-pce] [I-D.ietf-pce-stateful-pce]
Crabbe, E., Minei, I., Medved, J., and R. Varga, "PCEP Crabbe, E., Minei, I., Medved, J., and R. Varga, "PCEP
Extensions for Stateful PCE", draft-ietf-pce-stateful- Extensions for Stateful PCE", draft-ietf-pce-stateful-
pce-19 (work in progress), May 2017. pce-21 (work in progress), June 2017.
[I-D.ietf-pce-pce-initiated-lsp] [I-D.ietf-pce-pce-initiated-lsp]
Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "PCEP Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "PCEP
Extensions for PCE-initiated LSP Setup in a Stateful PCE Extensions for PCE-initiated LSP Setup in a Stateful PCE
Model", draft-ietf-pce-pce-initiated-lsp-09 (work in Model", draft-ietf-pce-pce-initiated-lsp-10 (work in
progress), March 2017. progress), June 2017.
10.2. Informative References 10.2. Informative References
[RFC4655] Farrel, A., Vasseur, J., and J. Ash, "A Path Computation [RFC4655] Farrel, A., Vasseur, J., and J. Ash, "A Path Computation
Element (PCE)-Based Architecture", RFC 4655, Element (PCE)-Based Architecture", RFC 4655,
DOI 10.17487/RFC4655, August 2006, DOI 10.17487/RFC4655, August 2006,
<http://www.rfc-editor.org/info/rfc4655>. <http://www.rfc-editor.org/info/rfc4655>.
[RFC5520] Bradford, R., Ed., Vasseur, JP., and A. Farrel, [RFC5520] Bradford, R., Ed., Vasseur, JP., and A. Farrel,
"Preserving Topology Confidentiality in Inter-Domain Path "Preserving Topology Confidentiality in Inter-Domain Path
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