1 / 7

Background

Encoding of Objective Functions in PCEP draft-ietf-pce-of-01.txt J.L. Le Roux (France Telecom) J.P. Vasseur (Cisco Systems) Y. Lee (Huawei). Background.

diella
Télécharger la présentation

Background

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Encoding of Objective Functions in PCEPdraft-ietf-pce-of-01.txtJ.L. Le Roux (France Telecom) J.P. Vasseur (Cisco Systems) Y. Lee (Huawei) IETF 70, PCE WG, Vancouver

  2. Background • The computation of one or a series of TE-LSPs is subject to an objective function (OF) • Unsynchronized computation: Minimum cost path, shortest widest path, widest shortest path, etc. • Synchronized computation: Minimize the load on the most loaded link, minimize the global bandwidth consumption, etc. • This drafts covers • the discovery of objective function supported by a PCE • the indication, in a request/response, of the objective function required/used

  3. Changes since last version • Draft adopted as WG document in Chicago • Moved OF discovery from PCED to PCEP • Factorized the OF in the reply for a set of synchronized requests • Rewordings for the sake of clarity

  4. Discovery of objective functions • Used to rely on PCE Discovery (OSPF/ISIS): A new sub-TLV, OF-List, carried in the OSPF/ISIS PCED TLV • Carried the list of supported objective functions • For scalability consideration, the IESG requested to close the OSPF/ISIS PCED TLV => no new sub-TLV can be added • So OF Discovery can no longer rely on the PCED TLV • Moved OF discovery from ISIS/OSPF to PCEP • This follows requirements set forth in 4657 and 4674 regarding the discovery of detailed capabilities • A new PCEP TLV has been defined, the OF-List TLV, to be carried within the OPEN object • This allows discovering the OF supported by a PCE during PCEP session setup phase

  5. OF Factorization in PCRep • The OF object in a PCRep for a set of synchronized requests MUST directly follow the corresponding SVEC object and MUST NOT be repeated for each elementary request

  6. Next Steps • Straightforward PCEP extension • Stable specification • Running code • Need for WG feedback • A new revision accounting for WG comments to be submitted before end December • Then ready for WG last call

  7. ThanksQuestions?

More Related