Network Working Group Yunbin Xu Internet Draft CATR Intended status: Informational Expires: October2015 Guoying Zhang CATR Weiqiang Cheng CMCC Haomian zheng Huawei April 27, 2015 Use Cases and Requirements of Dynamic Service Control based on Performance Monitoring in ACTN Architecture draft-xu-actn-perf-dynamic-service-control-03.txt Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on October 27, 2015. Copyright Notice Copyright (c) 2014 IETF Trust and the persons identified as the document authors. All rights reserved. Expires October 27,2015 [Page 1] Internet-Draft actn-perf-dynamic-service-control April 2015 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info)in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Abstract This document introduces the dynamic creation, modification and optimization of services based on the performance monitoring in the Abstraction and Control of Transport Networks (ACTN) architecture. Table of Contents 1. Introduction...................................................3 2. Use Cases and Requirements for Dynamic Service Control based on Performance Monitoring............................................3 2.1. Dynamic Service Control based on Traffic Monitoring.......3 2.2. Dynamic Service Control based on SLA monitoring...........4 3. Workflows of ACTN Control Modules..............................5 3.1. Workflows for Traffic Monitoring based Dynamic Service Control........................................................5 3.2. Workflows for SLA monitoring based Dynamic Service control6 4. Requirement for ACTN Interface.................................8 4.1. Interface Requirements for Dynamic Service Control Based on Traffic Monitoring.............................................8 4.2. Interface Requirements of Dynamic Service Control based on SLA monitoring.................................................9 4.3. Discussion................................................9 5. Security Considerations.......................................10 6. IANA Considerations...........................................10 7. References....................................................10 7.1. Informative References...................................10 Expires October 27,2015 [Page 2] Internet-Draft actn-perf-dynamic-service-control April 2015 1. Introduction The rapid growth of Internet traffic and the emerging applications such as cloud computing, datacenter interconnection, IP and optical integration, LTE backhauling, are driving the transport network to provide dynamic service provisioning based on the customer requirement and high quality services with guaranteed performance. For datacenter interconnection services, IP network transit links, LTE backhauling services or some business customer services, the traffic vary over time. However, traditional optical network could only provide connection based on the maximum bandwidth needed. Based on flow traffic monitoring, it is possible to adjust the connection bandwidth according to the real bandwidth needed, create new connections or increase bandwidth when network traffic exceeds some certain threshold or reduce connection bandwidth when traffic drops down, thus helping the customers to save cost. On the other hand, customers have different SLA requirements. Some customers such as financial service companies need ultra-low-latency transmission, some other customers has strict requirements on bit error rate (BER). In order to provide high quality services according to customer SLA, network provider needs to measure the service performance, and dynamically provision and optimize services based on the performance monitoring result. The optical transport networks support various performance monitoring mechanisms, such as traffic flow statistics, packet delay, delay variation, throughput and packet-loss rate for MPLS-TP and packet OTN networks, BER, FEC error correction counters for OTN and DWDM networks, etc. These mechanisms can be used to support dynamic service control based on performance monitoring. The Abstraction and Control of Transport Networks (ACTN) described in [ACTN-FWK] provides a centralized control architecture and open interfaces that can transmit the customer requirements and policies to the network, and provide customers with the network status to make a decision. This draft mainly discusses the use cases and requirements of dynamic service control based on performance monitoring in ACTN architecture, the requirements for southbound and northbound interface are also discussed. 2. Use Cases and Requirements for Dynamic Service Control based on Performance Monitoring 2.1. Dynamic Service Control based on Traffic Monitoring For LTE backhauling based on MPLS-TP packet transport networks(PTN) or packet OTN, it is required that real time or semi-real time Expires October 27,2015 [Page 3] Internet-Draft actn-perf-dynamic-service-control April 2015 traffic monitoring of the network should be conducted so as to resize or optimize traffic and do load balance. In IP and optical network integration scenario, the optical network can bypass IP transit traffic as far as the transit traffic bandwidth is large enough to occupy the granularity of an ODUk. Network traffic monitoring is important to facilitate automatic discovery of the imbalance of network traffic, and initiate the network optimization, thus helping the network operator or the virtual network service provider to use the network more efficiently and save CAPEX/OPEX. For datacenter interconnection or enterprise leased line services, the traffic may vary over time and the customer want to pay for the bandwidth they really used. Therefore, it is important to provide some mechanism to monitor the network traffic, adjust and optimize the services dynamically to help the customers save expenses. In order to support these scenarios, the customers or client layer network controllers need to send traffic monitoring and control policies to the network, while the transport network should report the traffic monitoring results and dynamically control and adjust network connections based on the traffic optimization policy. The service adjustment or network optimization operations normally should be initiated with the decision of the customer. 2.2. Dynamic Service Control based on SLA monitoring Customer services have various SLA requirements, such as service availability, latency, latency jitter, packet loss rate, BER, etc. The transport network can satisfy service availability and BER requirements by providing different protection and restoration mechanisms. However, for other performance parameters, there are no such mechanisms. In order to provide high quality services according to customer SLA, one possible solution is to measure the service SLA related performance parameters, and dynamically provision and optimize services based on the performance monitoring results. When the network performance deterioration that violates the SLA is detected, service optimization operations such as service rerouting, creation of new connections could be automatically started. In order to support this requirement, the customer should be able to send its SLA information to the network, and the transport network should determine which performance parameters need to be monitored and the strategy of service optimization. When the service performance degradation is detected, the transport network can Expires October 27,2015 [Page 4] Internet-Draft actn-perf-dynamic-service-control April 2015 notify the customer and immediately start the service optimization procedure, so as to reduce the impact on the service. 3. Workflows of ACTN Control Modules In the ACTN architecture [ACTN-FWK], centralized controllers including Physical Network Controller (PNC), Multi Domain Service Coordinator (MDSC), Customer Network Controller(CNC), and the interfaces between them have been defined. For different use cases and scenarios, the workflows across the customer controller, MDSC and PNC are different. 3.1. Workflows for Traffic Monitoring based Dynamic Service Control Figure 1 shows the workflows for dynamic service control based on traffic monitoring. In order to realize dynamic service creation, adjustment and optimization based on traffic monitoring, the customer controller should send traffic monitoring and traffic optimization strategies to MDSC. MDSC sends the corresponding path traffic monitoring request to PNC. Traffic monitoring parameters and monitoring cycle need to be carried in this request. PNC gets the traffic monitoring results from the underlying physical networks, translates the monitoring results of the physical topology to the performance information of the abstract topology, and then reports to MDSC. According to the traffic optimization strategy obtained from the customer controller, MDSC determines whether the service needs to be adjusted, or a new connection should be created. If it needs to, then MDSC send the traffic monitoring results to the customer controller, indicating that the service needs adjustment. Customer Network Controller confirms whether the service can be optimized then sends a service adjustment request to MDSC. MDSC will convert it into path modification or creation request, and send it to PNC to complete the service optimization. Then, PNC returns the optimization results to MDSC, and MDSC passes the results to the customer controller. +-------------------------------------------+ | CNC +-----------------------------+ | | | Dynamic Service Control APP | | | +-----------------------------+ | +-------------------------------------------+ 1.Traffic| /|\4.Traffic | /|\ Monitor& | | Monitor | | 8.Traffic Expires October 27,2015 [Page 5] Internet-Draft actn-perf-dynamic-service-control April 2015 Optimize | | Result 5.Service | | modify & Policy | | modify& | | optimize \|/ | optimize Req.\|/ | result +------------------------------------------------+ | MDSC +-------------------------------+ | | |Dynamic Service Control Agent | | | +-------------------------------+ | | +---------------+ +-------------------+ | | | Flow Optimize | | vConnection Agent | | | +---------------+ +-------------------+ | +------------------------------------------------+ 2. Path | /|\3.Traffic | | Monitor | | Monitor | |7.Path Request | | Result 6.Path | | modify & | | modify& | | optimize \|/ | optimize Req.\|/ | result +-------------------------------------------------------+ | PNC +----------------------+ +----------------------+ | | | Network Provisioning | |Abstract Topology Gen.| | | +----------------------+ +----------------------+ | | +------------------+ +--------------------+ | | |Network Monitoring| |Physical Topology DB| | | +------------------+ +--------------------+ | +-------------------------------------------------------+ Figure 1 Workflows for dynamic service control based on traffic monitoring 3.2. Workflows for SLA monitoring based Dynamic Service control Figure 2 shows the workflows for dynamic service control based on SLA related performance monitoring. Customer controller sends the customer service SLA information and the performance based optimization strategy to MDSC. MDSC will convert the SLA information to path performance monitoring request, which carries the performance monitoring parameters such as delay, jitter, packet loss, bit error rate and monitoring cycle, and then send it to the PNC. PNC starts the performance monitoring in the underlying physical networks, collects the results of related path, translates the performance results of the physical topology to the performance information of the abstract topology, and reports to MDSC. MDSC Expires October 27,2015 [Page 6] Internet-Draft actn-perf-dynamic-service-control April 2015 determines whether the relevant performance parameters can satisfy the SLA agreements. If the performance degradation seriously influences the service, such as service packet delay exceeds the performance threshold, MDSC will immediately start the optimization and adjustment. Then the performance monitoring results as well as the optimizing or adjusting results will be send to the Customer Network Controller. +-------------------------------------------+ | CNC +-----------------------------+ | | | Dynamic Service Control APP | | | +-----------------------------+ | +-------------------------------------------+ 1. SLA& | /|\6.SLA | Optimize | | Monitor, modify & | Policy | | Optimize | | | Result | 7.Ack \|/ | \|/ +---------------------------------------------+ | MDSC +-------------------------------+ | | |Dynamic Service Control Agent | | | +-------------------------------+ | | +---------------+ +-------------------+ | | | Flow Optimize | | vConnection Agent | | | +---------------+ +-------------------+ | +---------------------------------------------+ 2. Path | /|\3.SLA | /|\ Monitor | | Monitor | |5.Path Request | | Result 4.Path | | Modify & | | Modify& | | Optimize \|/ | Optimize Req.\|/ | Result +---------------------------------------------------------+ | PNC +----------------------+ +----------------------+ | | | Network Provisioning | |Abstract Topology Gen.| | | +----------------------+ +----------------------+ | | +------------------+ +--------------------+ | | |Network Monitoring| |Physical Topology DB| | | +------------------+ +--------------------+ | +---------------------------------------------------------+ Figure 2 Workflows for dynamic service control based on SLA monitoring Expires October 27,2015 [Page 7] Internet-Draft actn-perf-dynamic-service-control April 2015 4. Requirement for ACTN Interface ACTN Interfaces defined [ACTN-FWK] includes the following: o CNC-MDSC Interface (CMI): an interface between a Customer Network Controller and a Multi Service Domain Controller. o MDSC-PNC Interface (MPI): an interface between a Multi Service Domain Controller and a physical network controller. 4.1. Interface Requirements for Dynamic Service Control Based on Traffic Monitoring According to the work flow of dynamic service control based on performance monitoring, the information carried in CMI interface mainly relates to the traffic monitoring and control strategy, while the MPI interface mainly relates to transports path related traffic monitoring parameters and results. 1. CMI Interface The following information is used by the customer network controller to send to MDSC through the CMI interface. o Customer service performance monitoring strategy, including the traffic monitoring object (the service need to be monitored), monitoring parameters (e.g., transmitted and received bytes per unit time), traffic monitoring cycle (e.g., 15 minutes, 24 hours), threshold of traffic monitoring (e.g., high and low threshold), etc. o Customer service optimization strategy, such as enabling service creation or modification when traffic exceeds the threshold. The following information is used for MDSC to send to the customer network controller through MPI interface. o Traffic monitoring results, to indicate if the traffic exceeds the bandwidth threshold. 2. MPI Interface The following parameters are used for MDSC to send to PNC. o Traffic monitoring parameters, monitoring object, monitoring cycle, performance threshold. The following information is used for PNC to send to MDSC. Expires October 27,2015 [Page 8] Internet-Draft actn-perf-dynamic-service-control April 2015 o Traffic monitoring results. These results must be translated from the physical topology to abstract topology by the Abstract Topology Generalization module firstly. 4.2. Interface Requirements of Dynamic Service Control based on SLA monitoring According to the work flow of dynamic service control based on SLA monitoring, the information in VCI interface mainly contains the SLA related information and measurement strategy, while the MPI interface mainly transports path related performance monitoring parameters and results. 1. CMI Interface The following information is used by the customer network controller to send to the MDSC through CMI interface. o SLA related performance requirement information, including the required quality of service parameters (e.g., BER, delay, delay jitter, packet loss rate, throughput, etc.). o Service optimization strategy, including the service performance degradation thresholds and the consequent operations that are allowed (e.g., rerouting). The following information is used by the customer network controller to send to MDSC. o Monitoring results of service performance, including performance monitoring parameters, and the services that have been influenced. o Service optimization results based on performance. 2. MPI Interface The following information is used by MDSC to send to PNC. o The path performance monitoring request parameters, monitoring cycle and threshold. The following information is used for PNC sending to MDSC. o Path performance monitoring results. 4.3. Discussion Performance monitoring in a large scale network could generate a huge amount of performance information. Therefore, the appropriate Expires October 27,2015 [Page 9] Internet-Draft actn-perf-dynamic-service-control April 2015 way to deliver the information in CMI and MPI interfaces should be carefully considered. 5. Security Considerations This document raises no new security issues. 6. IANA Considerations No new IANA considerations are raised by this document. 7. References 7.1. Informative References [ACTN-FWK] Daniele C., Luyuan Fang, Yong Lee and Diego Lopez, "Framework for Abstraction and Control of Transport Networks",draft-ceccarelli-actn-framework-07. Authors' Address Yunbin Xu China Academy of Telecom Research NO.52 Huayuan Beilu, Haidian District, Beijing, China Email: xuyunbin@catr.cn Guoying Zhang China Academy of Telecom Research NO.52 Huayuan Beilu, Haidian District, Beijing, China Email: zhangguoying@catr.cn Weiqiang Cheng China Mobile Communication Company Email:chengweiqiang@chinamobile.com Haomian Zheng Huawei Technologies F3-1-B R&D Center, Bantian, Longgang District Shenzhen, China Email: zhenghaomian@huawei.com Expires October 27,2015 [Page 10]