Hello Haomian, I would have some comments/clarification on the updated part of this draft.
Section 2.2 I have some problem with your last part of the session: " During this procedure higher-layer PCE can only use LSP1 information (such as its five-tuple LSP information) as the information, an issue to solve is how lower-layer PCE can resolve this information to the actual resource usage in its own layer, i.e. lower layer. This could be solved by edge LSR L1 reporting this higher-lower layer LSP correlation to the lower-layer PCE as part of the LSP information during the LSP state synchronization process. If needed, it can be later updated when there is a change in this information. Alternatively, the lower-layer PCE can get this information from other sources, such as network management system, where this information should be stored." Questions: a) what LSP1 information are you referring ? which tuple? H1-H2-H3-H4-H5 ? b) What issue has to solve the Lo PCE ?I sit not the Hi PCE indicating entry and exit point at lower layer as for RFC 5623 session 3.2? c) Could you elaborate a little this mapping problem you mention? " The process would be similar to that of the previous scenario. A point worth noting is that the border LSR node may be able to resolve the higher layer LSP information itself, such as mapping it to the corresponding LSP in the lower layer, in this way lower-layer PCE does not need to perform this function. Otherwise, the mapping method mentioned above can still be used. " Question: a)What mapping method are you referring to ? Not clear whether and how you indicate to solve the problem. Thanks a lot BR Sergio -----Original Message----- From: Pce [mailto:[email protected]] On Behalf Of Zhenghaomian Sent: venerdì 27 febbraio 2015 07:53 To: [email protected] Subject: [Pce] 转发: New Version Notification for draft-zhang-pce-resource-sharing-03.txt Dear PCEers, We update the draft on PCE for resource sharing according to some offline comments, following changes are included in the updated version; - Use Case 2 is modified to describe the inter-layer resource sharing scenario; - Specify resource sharing as a possible policy during path computation; - Correct the semantic meaning of D and R bits in Section 5.2; - Editorial changes; Your review comments are most welcome. Thanks. Best wishes, Haomian -----邮件原件----- 发件人: [email protected] [mailto:[email protected]] 发送时间: 2015年2月27日 14:39 收件人: Oscar Gonzalez de Dios; Zhenghaomian; Victor Lopez; Zhangxian (Xian); Zhangxian (Xian); Oscar Gonzalez de Dios; Victor Lopez; Zhenghaomian 主题: New Version Notification for draft-zhang-pce-resource-sharing-03.txt A new version of I-D, draft-zhang-pce-resource-sharing-03.txt has been successfully submitted by Haomian Zheng and posted to the IETF repository. Name: draft-zhang-pce-resource-sharing Revision: 03 Title: Extensions to Path Computation Element Protocol (PCEP) to Support Resource Sharing-based Path Computation Document date: 2015-02-27 Group: Individual Submission Pages: 14 URL: http://www.ietf.org/internet-drafts/draft-zhang-pce-resource-sharing-03.txt Status: https://datatracker.ietf.org/doc/draft-zhang-pce-resource-sharing/ Htmlized: http://tools.ietf.org/html/draft-zhang-pce-resource-sharing-03 Diff: http://www.ietf.org/rfcdiff?url2=draft-zhang-pce-resource-sharing-03 Abstract: Resource sharing in a network means two or more Label Switched Paths (LSPs) use common piece(s) of resource along their paths. This can help save network resource and useful in scenarios such as LSP recovery or when two LSPs do not need to be active at the same time. A Path Computation Element (PCE) is a centralized entity, responsible for path computation. Given this feature and its access to the network resource information and possibly active LSPs information, it can be used to support resource-sharing-based path computation with better efficiency. This document extends the Path Computation Element Protocol (PCEP) in order to support resource sharing-based path computation. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat _______________________________________________ Pce mailing list [email protected] https://www.ietf.org/mailman/listinfo/pce _______________________________________________ Pce mailing list [email protected] https://www.ietf.org/mailman/listinfo/pce
