Hi, Peng: Thank for your comment. If cost metrics don't change or change not very frequently, e.g.,maximum bandwidth represents link capacity and usually doesn't change. For those cost metric, such cost parameter does not need or can be ignored. However for cost metrics which do make frequently changes over measurement interval, such metrics need to rely on measurement interval to know Whether or how cost metric, e.g., bandwidth change during a period of time. The measurement interval can be preconfigured.
Take cost metrics defined in this draft as an example, these cost metrics are derived from ISIS-TE or OSPF-TE, so we can rely on IGP protocol to Specify such configurable interval. If we gather these cost metrics from other means, we need to figure out how to measure schedule of the metrics just As you said, could be control plane based or management plane based. I prefer we should focus on using some mechanisms that have been already standardized to decide schedule of cost metrics rather than basing on some proprietary solutions. Regards! -Qin -----Original Message----- From: He, Peng [mailto:[email protected]] Sent: Wednesday, October 23, 2013 9:09 PM To: Qin Wu; IETF ALTO Subject: RE: I-D Action: draft-wu-alto-te-metrics-00.txt Another side question: is there a 'cost' parameter that can show/represent the 'schedule' of the network links, e.g., before 12pm this link/tunnel will have say 100Mbps available, after 12pm, only 50mbps available, i.e., bandwidth scheduling or similar? Or this is more a management system/controller/server related data? Regards, Peng -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Qin Wu Sent: Tuesday, October 22, 2013 9:17 PM To: IETF ALTO Subject: [alto] FW: I-D Action: draft-wu-alto-te-metrics-00.txt Hi, all: We have posted a new draft to define a set of new cost metrics that are related to traffic engineering performance information. http://tools.ietf.org/html/draft-wu-alto-te-metrics-00 Please review the draft and provide your feedback and comments. Regards! -Qin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, October 21, 2013 2:08 PM To: [email protected] Subject: I-D Action: draft-wu-alto-te-metrics-00.txt A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : ALTO Traffic Engineering Cost Metrics Author(s) : Qin Wu Young Lee Dhruv Dhody Sabine Randriamasy Filename : draft-wu-alto-te-metrics-00.txt Pages : 26 Date : 2013-10-20 Abstract: Cost Metric is a basic concept in Application-Layer Traffic Optimization (ALTO). It is used in both the Cost Map Service and the Endpoint Cost Service. Future extensions to ALTO may also use Cost Metric. Different applications may benefit from different Cost Metrics. For example, a Resource Consumer may prefer Resource Providers that have low latency to the Resource Consumer. However the base ALTO protocol [ALTO] has defined only a single cost metric, i.e., the generic "routingcost" metric (Sec. 14.2 of ALTO base specification [ALTO]). In this document, we define XXX Cost Metrics, derived from OSPF-TE and ISIS-TE, to measure network delay, jitter, packet loss, hop count, and bandwidth. The metrics defined in this document provide a relatively comprehensive set of Cost Metrics for ALTO focusing on traffic engineering. Additional Cost Metrics such as financial cost metrics may be defined in other documents. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-wu-alto-te-metrics There's also a htmlized version available at: http://tools.ietf.org/html/draft-wu-alto-te-metrics-00 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. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ I-D-Announce mailing list [email protected] https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft directories: http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt _______________________________________________ alto mailing list [email protected] https://www.ietf.org/mailman/listinfo/alto _______________________________________________ alto mailing list [email protected] https://www.ietf.org/mailman/listinfo/alto
