ACTN BOF D. Dhody Internet-Draft X. Zhang Intended status: Informational Huawei Technologies Expires: November 27, 2014 O. Gonzalez de Dios Telefonica D. Ceccarelli Ericsson B. Yoon ETRI May 26, 2014 Packet Optical Integration (POI) Use Cases for Abstraction and Control of Transport Networks (ACTN) draft-dhody-actn-poi-use-case-02 Abstract This document describes the Abstraction and Control of Transport Networks (ACTN) use cases related to Packet and Optical Integration (POI), that may be potentially deployed in various transport networks and apply to different applications. 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). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. POI Scenario . . . . . . . . . . . . . . . . . . . . . . 4 1.2. Requirements Language . . . . . . . . . . . . . . . . . . 6 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6 3. Packet Optical Integration . . . . . . . . . . . . . . . . . 7 3.1. Traffic Planning, Monitoring and Automatic Network Adjustments . . . . . . . . . . . . . . . . . . . . . . . 7 3.1.1. Automated Congestion Management . . . . . . . . . . . 8 3.2. Protection and Restoration Synergy . . . . . . . . . . . 8 3.3. Service Awareness . . . . . . . . . . . . . . . . . . . . 8 3.4. Coordination between Multiple Network Domains . . . . . . 9 4. Security Considerations . . . . . . . . . . . . . . . . . . . 10 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.1. Normative References . . . . . . . . . . . . . . . . . . 11 7.2. Informative References . . . . . . . . . . . . . . . . . 11 Appendix A. Contributor Addresses . . . . . . . . . . . . . . . 12 1. Introduction Network operators build and operate multi-layered multi-domain networks and these domains may be technology, administrative or vendor specific (vendor islands). Interoperability for dealing with different domains is a perpetual problem for operators. Due to these issues, new service introduction, often requiring connections that traverse multiple domains, need significant planning, and several manual operations to interface different vendor equipment and technology accross IP and Optical layers. The aim of Abstraction and Control of Transport Networks (ACTN) is to facilitate virtual network operation, creation of a virtualized environment allowing operators to view and control multi-subnet multi-technology networks into a single virtualized network. This will accelerate rapid service deployment of new services, including more dynamic and elastic services, and improve overall network operations and scaling of existing services. Dhody, et al. Expires November 27, 2014 [Page 2] Internet-Draft ACTN-POI-USECASE May 2014 [ACTN-FWK] describes a business model of ACTN, comprising of customers, service providers and network providers. This separates the network operations on physical network from the business needs (based on virtual network). Discussion with operators has highlighted a need for virtual network operation based on the abstraction of underlying technology and vendor domains. This would be used for a variety of key use cases, including: o Physical network infrastructure providers who want to build virtual network operations (VNO) infrastructure via standards- based API that facilitates automation and operation of multiple virtual networks for both internal and external trust domains. o Data Center operators that need to lease facility from a number of physical network infrastructure providers to offer their global data center applications and services. As they face multi-domain and diverse transport technology, interoperability based on standard-based abstraction will enable dynamic and flexible applications and services. The transport networks are in an unique position to embrace the concepts of software defined networking (SDN) because of the existing separation in control and forwarding plane via GMPLS/ASON. The path computation element (PCE) [RFC4655] and its stateful extension [STATEFUL-PCE] can further provide a central control over the resources. Also [STATEFUL-PCE-INITIATED] provides capability to initiate and delete LSP dynamically. ACTN is focused on building over the existing blocks by adding programmability, access and control over abstract virtual topologies. [ACTN-PROBLEM] and [ACTN-FWK] provide detailed information regarding this work. Further [ACTN-USECASE] describe the overall use-cases for ACTN. This document focuses on the Packet and Optical Integration (POI) use cases of ACTN. We refer to POI as packet over any connection- oriented transport technologies such as MPLS-TE, MPLS-TP, OTN or WSON. It is preferable to coordinate network resource control and utilization rather than controlling and optimizing resources at each network layer (packet and optical transport network) independently. This facilitates network efficiency and network automation. In a multi-layer network via client and server networking roles, Label Switched Paths (LSPs) in a server (lower) layer are used to carry client (higher) layer LSPs across the server (lower) layer network. Packet and Optical Integration (POI) in a distributed control plane environment may be achieved by some of the existing Dhody, et al. Expires November 27, 2014 [Page 3] Internet-Draft ACTN-POI-USECASE May 2014 mechanism as specified in [RFC4208] and [RFC5623]. This document explores the POI use cases of ACTN to help provide programmable network services like orchestration, access to abstract topology and control over the resources. Increasingly there is a need for packet and optical transport networks to work together to provide accelerated services. Transport networks can provide useful information to the packet network allowing it to make intelligent decisions and control its allocated resources. 1.1. POI Scenario This section explores some typical scenario for packet and optical integration (POI). These include, but not limited to, a single administrative domain as well as Carriers-of-Carrier case. Figure 1 shows a single administrative domain comprising of both Packet and Optical transport networks. A POI coordinator would help build and operate a multi-layered multi-domain allowing operators to view and control a single virtualized network. Dhody, et al. Expires November 27, 2014 [Page 4] Internet-Draft ACTN-POI-USECASE May 2014 +------------+ +------------------+ POI | | |Orchestrator| | +-----+------+ (VNC) +-v---+ | | | | +-----+ +--v--+ Packet | | Control +-----+ (PNC) Optical Control (PNC) +------------+ +---------------------------+ +--------------+ | | | | | | | +-+ | | +-+ +-+ | | +-+ +-+ | | |R| |***|O| |O|********|R| |R| | | +-+ +-+ |*| +-+ +-+ +-+ | | +-+ +-+ | | |R|*****| |O| | | | | +-+*****| +-+ | | | | +-+ |*| +-+ +-+ +-+ | | +-+ | | |R| |*****|O| |O| |O|*******|R| | | +-+ | | +-+ +-+ +-+ | | +-+ | | | | | | | +------------+ +---------------------------+ +--------------+ Packet Optical Transport Packet Network Network Network Figure 1: POI for single adminstration Figure 2 shows a Carriers-of-Carrier case, where an optical transport infrastructure provider provides ACTN service to the ISP. Dhody, et al. Expires November 27, 2014 [Page 5] Internet-Draft ACTN-POI-USECASE May 2014 +-------------+ | ISP | | Controler | +------------+------+------+---------------+ | | | | | | | V | | +------------+ | | | VNC | | | | | | | +------------+ | | | | | | | | V | | +------------+ | +-+-------+ | PNC | +--------+-+ | -- | | | | -- | | | | | +------------+ || | | | -- | | -- -- | | -- | +-----------------+ | -- | | | | | |**** | -- -- | ***| | -- | | -- |*****| | | |**** | -- | +---------+ | -- -- | +----------+ ISP | -- | ISP (Packet) | | | -- | (Packet) | -- | | | | -- | +-----------------+ Infrastructre Provider (optical) Figure 2: POI for Carriers-of-Carrier 1.2. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Terminology The following terminology is used in this document. ACTN: Abstraction and Control of Transport Networks. PCE: Path Computation Element. An entity (component, application, or network node) that is capable of computing a network path or Dhody, et al. Expires November 27, 2014 [Page 6] Internet-Draft ACTN-POI-USECASE May 2014 route based on a network graph and applying computational constraints. POI: Packet and Optical Integration VNTM: Virtual Network Topology Manager 3. Packet Optical Integration Connections (or tunnels) formed across the optical transport network, can be used as virtual TE links in the packet network. The relationship is reduced to determining which tunnels to set up, how to trigger them, how to route them, and what capacity to assign them. As the demands in the packet network vary, these tunnels may need to be modified. An entity in packet network - (maybe a Path Computation Element (PCE), Virtual Network Topology Manager (VNTM) [RFC5623], Controller etc..) should be aware of the abstract topology of the optical transport network. This entity is the customer controller as per [ACTN-FWK] which interacts with Virtual Network Controller (VNC). The abstract topology may consist of established tunnels in optical transport network or ones that can be created on demand. The level of abstraction is dependent on various management, security and policy considerations. This abstract topology information in the packet network can be utilized in various cases, as detailed in the following sections. 3.1. Traffic Planning, Monitoring and Automatic Network Adjustments Currently there is a schism between network planning for packet and optical transport networks. Sometimes these networks are administered, operated and planned independently even when they are a part of a single trusted domain. Any change in traffic requirements requires long business process to make changes in the network. In dynamic networks this is no longer acceptable. A unified Packet+Optical traffic planning tool can be developed which uses the traffic demand matrix to plan the optical transport network. Further based on traffic demand changes, historical data, traffic prediction and monitoring, changes should be made to the optical transport network. An access to abstract topology of the optical transport network based on established and potential (on-demand) tunnels in optical transport network can provide mechanism to handle this. Further optical bypass may be established automatically to offload the continuous changing traffic to optical transport network allowing Dhody, et al. Expires November 27, 2014 [Page 7] Internet-Draft ACTN-POI-USECASE May 2014 streamlined business process between packet and optical transport networks. 3.1.1. Automated Congestion Management Congestion management and synergized network optimization for packet and optical transport networks can eliminate the need for overbooking of optical transport networks as dumb pipes. Application could be written that provide automated congestion management and network optimization. Automated congestion management recognizes prolonged congestion in the network and works with the controllers to add bandwidth at an optical transport layer, to alleviate the congestion, or make changes in the packet layer to reroute traffic around the congestion. For such applications there is a clear need for an abstract network topology of optical transport layer, further there is also a need for a synergy of cost and SLA across optical and packet networks. 3.2. Protection and Restoration Synergy The protection and restoration are usually handled individually in Packet and optical layer. There is a need for synergy and optimized handling of protection of resources across layers. A lot more resources in the optical transport network are booked for backup then actually required since there is a lack of coordination between packet and optical layers. The access to abstract graph of optical transport network with information pertaining to backup path information can help the packet network to handle protection, shared risk, fault restoration in an optimized way. Informing the packet network about both working and protection path which are either already established, or potential path can be useful. A significant improvements in overall network availability that can be achieved by using optical transport shared-risk link group (SRLG) information to guide packet network decisions; for example, to avoid or minimize common SRLGs for the main (working) path and the loop free alternative or traffic engineered fast reroute (LFA/TE FRR) back-up path. Shared risk information need to be synergized between the packet and optical. A mechanism to provide abstracted SRLG information can help the packet network consider this information while handling protection and restoration. 3.3. Service Awareness In certain networks like financial information network (stock/ commodity trading) and enterprises using cloud based applications, Latency (delay), Latency-Variation (jitter), Packet Loss and Dhody, et al. Expires November 27, 2014 [Page 8] Internet-Draft ACTN-POI-USECASE May 2014 Bandwidth Utilization are associated with the SLA. These SLAs must be synergized across packet and optical transport networks. Network optimization evaluates network resource usage at all layers and recommends or executes service path changes while ensuring SLA compliance. It thus makes more effective use of the network, and relieves current or potential congestion. The main economic benefits of ACTN arise from its ability to maintain the SLA of the services at reduced overall network cost considering both packet and optical transport network. Operational benefits of the ACTN also stem from greater flexibility in handling dynamic traffic such as demand uncertainty or variations over time, or optimization based on cost or latency, or improved handling of catastrophic failures. 3.4. Coordination between Multiple Network Domains In some deployments, optical transport network may further be divided into multiple domains, an abstracted topology comprising of multiple optical domains MAY be provided to the packet network. A Seamless aggregation and orchestration across multiple optical transport domains is achieved via the VNC, a great help in such deployments. Another interesting deployment involves multiple packet network domains. There exist scenarios where the topology provided to the packet network domains may be different based on the initial demand matrix as well as, management, security and policy considerations. The ACTN framework as described in [ACTN-FWK] should support the aggregation and orchestration across network domains and layers. Further Figure 3 shows a multi-domain scenario where multiple PNC (each controlling a packet or optical domain) and a VNC coordinating among them and providing a consolidated view. Dhody, et al. Expires November 27, 2014 [Page 9] Internet-Draft ACTN-POI-USECASE May 2014 +-------------------------+ | VNC | | | +-------------------------+ * +------------+---------+--+ * +-----------+---------+--+ | +---------+ | * | +---------+ | | | PNC ************************* PNC | | | +---------+---------+ | * | +---------+---------+ | | | | | * | | | | | | | | * | | | | | | | | * | | | | | | Packet | | * | | Packet | | | +-------------------+ | * | +-------------------+ | | | * | | | | * | | | | * | | | | * | | | | * | | | +---------+ | * | +---------+ | | | PNC ************************* PNC | | | +---------+---------+ | | +---------+---------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | Optical | | | | Optical | | | +-------------------+ | | +-------------------+ | +---+-------------------+-+ +--+-------------------+-+ Domain 1 Domain 2 Figure 3: Coordination between Multiple Network Domains 4. Security Considerations TBD. 5. IANA Considerations None, this is an informational document. 6. Acknowledgments TBD. Dhody, et al. Expires November 27, 2014 [Page 10] Internet-Draft ACTN-POI-USECASE May 2014 7. References 7.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 7.2. Informative References [RFC4208] Swallow, G., Drake, J., Ishimatsu, H., and Y. Rekhter, "Generalized Multiprotocol Label Switching (GMPLS) User- Network Interface (UNI): Resource ReserVation Protocol- Traffic Engineering (RSVP-TE) Support for the Overlay Model", RFC 4208, October 2005. [RFC4655] Farrel, A., Vasseur, J., and J. Ash, "A Path Computation Element (PCE)-Based Architecture", RFC 4655, August 2006. [RFC5623] Oki, E., Takeda, T., Le Roux, JL., and A. Farrel, "Framework for PCE-Based Inter-Layer MPLS and GMPLS Traffic Engineering", RFC 5623, September 2009. [STATEFUL-PCE] Crabbe, E., Medved, J., Minei, I., and R. Varga, "PCEP Extensions for Stateful PCE [draft-ietf-pce-stateful- pce]", October 2013. [STATEFUL-PCE-INITIATED] Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "PCEP Extensions for PCE-initiated LSP Setup in a Stateful PCE Model [draft-ietf-pce-pce-initiated-lsp]", December 2013. [ACTN-FWK] Ceccarelli, D., Fang, L., Lee, Y., and D. Lopez, "Framework for Abstraction and Control of Transport Networks (draft-ceccarelli-actn-framework)", January 2014. [ACTN-PROBLEM] Lee, Y. and D. King, "Problem Statement for Abstraction and Control of Transport Networks (draft-leeking-actn- problem-statement)", February 2014. [ACTN-USECASE] Dhody, D., Zhang, X., and O. Gonzalez de Dios, "Use Cases for Abstraction and Control of Transport Networks (ACTN) (draft-dhodyzhang-actn-use-case-00)", February 2014. Dhody, et al. Expires November 27, 2014 [Page 11] Internet-Draft ACTN-POI-USECASE May 2014 Appendix A. Contributor Addresses Bin-Yeong Yoon ETRI SOUTH KOREA EMail: byyun@etri.re.kr Udayasree Palle Huawei Technologies Leela Palace Bangalore, Karnataka 560008 INDIA EMail: udayasree.palle@huawei.com Authors' Addresses Dhruv Dhody Huawei Technologies Leela Palace Bangalore, Karnataka 560008 INDIA EMail: dhruv.ietf@gmail.com Xian Zhang Huawei Technologies Bantian, Longgang District Shenzhen, Guangdong 518129 P.R.China EMail: zhang.xian@huawei.com Oscar Gonzalez de Dios Telefonica SPAIN EMail: ogondio@tid.es Dhody, et al. Expires November 27, 2014 [Page 12] Internet-Draft ACTN-POI-USECASE May 2014 Daniele Ceccarelli Ericsson Via E. Melen 77, Genova - Erzelli Italy EMail: daniele.ceccarelli@ericsson.com Bin-Yeong Yoon ETRI South Korea EMail: byyun@etri.re.kr Dhody, et al. Expires November 27, 2014 [Page 13]