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Path Computation Element Metric Protocol (PCEMP) - A Generic Computational Model for Inter-Domain Path Computation

PCEMP is a protocol used as an application path computation framework for PCE peers in inter-domain scenarios. It maintains an adjacency state and supports peer adjacency through non-participating interior nodes. This draft proposes protocol independent metrics and criteria for path computation techniques.

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Path Computation Element Metric Protocol (PCEMP) - A Generic Computational Model for Inter-Domain Path Computation

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  1. Path Computation Element Metric Protocol (PCEMP)(draft-choi-pce-metric-protocol-02.txt) PCE WG (63rd. IETF) August 2, 2005 Paris, France Jun Kyun Choi and Dipnarayan Guha (jkchoi@icu.ac.kr, dg236@cornell.edu)

  2. Some FAQs about PCEMP • What is the PCEMP? • It’s a protocol for a generic computational model that is used as an application path computation framework for any PCE “peer” in inter-domain scenarios. • Drives the PCE “peer network” by soft-configuration on supporting network peers. • How does it work? • Maintains a “state” of adjacency by data-driven mapping of external routing information on node routing tables • Soft-configuration, in this context, is defined as a mechanism that splits the network tree into a combination of sparse sub-trees for fast computation. • The network architecture is optimally partitioned into a set of PCEDAs (PCE Domain Areas), which can be one or more Autonomous Systems, inter-domains etc.

  3. Support for peer adjacency through non-participating interior nodes Protocol is generic, PCEMP maintains adjacencies over inter-domains and multi-layer networks by considering them as opaque Data-driven mechanism for protocol FSM execution is flow based  no additional configuration updates necessary to PCEs attached to networks Partitioning the virtual network into PCE Domain Areas (PCEDAs) In-line with the protocol architecture that provides branch-wise granularity in data protection within an autonomous system In the peer service model, the provider partitions the TE links within the provider network per client solicitation, and discloses per client TE link info to corresponding clients  Partitioning into PCEDAs with PCEMP is a direct driver to this Main features of PCEMP

  4. Common Header Mode of using PCEMP – path computation and/or path computation/communication Establish Request Path Computation (Sync/Async modes), prioritization of path computation Respond Returns path / nature of path computation Error Returns path computation failure reason, currently supports a negotiate object for responder Teardown Explicit path computation delete request / change in path computation style ACK Test alive process PCEMP message formats

  5. Test setup for PCEMP deployment (work-in-progress) High Speed Internet Backbone BcN REN (old KOREN) 201.107.248.18/32 ICU Client Network Client Edge CE node1 PCEMP Tunnel ETRI Gateway PE router: PCEMP peer PCEMP peer auto configuration ICU Gateway 201.107.248.17 PCEMP peer auto configuration 220.69.180.220 /32 허브 PE router: PCEMP peer P router: PCEMP peer Client Edge CE node2 ETRI Client Network 220.69.180.206 220.69.180.205 ETRI Network ICU PCEMP Test-Bed

  6. PCE WG protocol standardization pointers • PCEMP is a generic routing and path computation protocol targeted towards inter-domain PCE peers that runs on any PCE unit that is capable of computing a path based on an ordered graph • This draft proposes to elucidate protocol independent metrics defining path quality measurement criteria, algorithm complexity and scalability criteria related to path computation techniques through the PCEMP and is in line with the PCE WG Charter • This draft is an independent effort in the PCE WG and comes out with results very much in striking alignment with the protocol requirements spec

  7. Authors’ standardization works in the PCE WG Jun Kyun Choi, Dipnarayan Guha et al., “Path Computation Element Metric Protocol (PCEMP)”, IETF internet draft, August 2005 http://www.ietf.org/internet-drafts/draft-choi-pce-metric-protocol-02.txt Jun Kyun Choi, Dipnarayan Guha et al., “Framework of PCEMP based Layer 1 Virtual Private Network”, IETF internet draft, August 2005 http://www.ietf.org/internet-drafts/draft-choi-pce-l1vpn-framework-02.txt Jun Kyun Choi, Dipnarayan Guha et al., “Fast End-to-End Restoration Mechanism with SRLG using Centralized Control, IETF internet draft, February 2005 http://www.ietf.org/internet-drafts/draft-choi-pce-e2e-centralized-restoration-srlg-03.txt Jun Kyun Choi, Dipnarayan Guha et al., “Fast IPv6 PCE peer advertisement using PCEMP”, IETF internet draft, August 2005 http://www.ietf.org/internet-drafts/draft-choi-pcemp-ipv6-02.txt Public demo of PCEMP deployment software IEEE ICACT 2005, Phoenix Park, Republic of Korea, February 23, 2005 IEEE INFOCOM 2005, Miami, FL, U.S.A., March 15, 2005 Work-in-progress at the BcN Engineering Research Center, Broadband Network Laboratory, ICU, Republic of Korea Related works and PCEMP deployment

  8. THANK YOU Thank You

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