Network Working Group G. Yan Internet-Draft J. Yang Intended status: Experimental Z. Li Expires: August 22, 2013 Huawei Technologies February 18, 2013 OSPF Extensions for MPLS Green Traffic Engineering draft-li-ospf-ext-green-te-00 Abstract The energy-saving is one important topic in the world, and now most of technology for energy-saving is related with the hardware design instead of that based on the whole network. This document proposes OSPF extensions to synchronize the energy-saving parameter of each node in the network which will be considered when the LSP path is calculated. 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 [RFC2119]. 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/. 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." This Internet-Draft will expire on August 22, 2013. Copyright Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Yan, et al. Expires August 22, 2013 [Page 1] Internet-Draft OSPF for Green TE February 2013 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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Overview of MPLS Green Traffic Engineering . . . . . . . . . . 3 3. Energy-saving Design of Network Nodes . . . . . . . . . . . . . 4 4. Parameters of Energy-saving Design . . . . . . . . . . . . . . 4 5. OSPF Extensions . . . . . . . . . . . . . . . . . . . . . . . . 4 5.1. Energy consumption of Link TLV . . . . . . . . . . . . . . 4 6. Enhanced CSPF Algorithm for Green TE . . . . . . . . . . . . . 5 7. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 9. Normative References . . . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Yan, et al. Expires August 22, 2013 [Page 2] Internet-Draft OSPF for Green TE February 2013 1. Introduction Energy-saving has become a global topic. Network equipments consume a lot of energy which has to be saved as the data forwarding is not affected. Energy-saving design of networks includes a number of aspects: on the one hand, the energy-saving design of the device hardware should be considered, such as the use of low energy consumption elements for hardware design, or, the use of digital power to improve power efficiency. On the other hand, the energy-efficient design in the planning of the network should be considered so that forwarding paths can choose the path of least power consumption for traffic forwarding. The document focuses on energy-saving based on the whole network. The energy-saving design of the hardware is out of scope of the document. MPLS TE, a very popular technology in existing networks, concerns about the overall network performance optimization to provide efficient and reliable network services to optimize the use of network resources and optimize network traffic. MPLS TE can also provide resource reservation so that the operator can precisely control the traffic paths to avoid the congested nodes and provide better QoS. However, the energy consumption of the device and link is not considered in the MPLS path calculation. Therefore, this document describes an optimization of MPLS TE by considering the energy consumption parameters of the device in the calculation of the forwarding path, in ensuring the normal forwarding of the user traffic in the premise, and to reduce the energy consumption of the entire network. 2. Overview of MPLS Green Traffic Engineering In order to support energy-saving in MPLS TE, following functions have to be supported in each node of one network: 1. Each node in network should have its own energy-saving design in physical level. 2. Energy-related parameters of the device and the link should be able to be determined by each node in the network. 3. IGP extension should be proposed to flood all these parameters within the MPLS TE domain. Yan, et al. Expires August 22, 2013 [Page 3] Internet-Draft OSPF for Green TE February 2013 4. CSPF should be extended to consider these energy-related parameters to calculate paths with least power consumption. 3. Energy-saving Design of Network Nodes The goal of this document is about the design of the network-level energy-saving, but energy-saving design of each device in the network is still very important. It is the basis for the energy saving of the network. Without the energy-saving design of the network nodes, it is difficult to achieve the energy-saving of the whole network. 4. Parameters of Energy-saving Design In MPLS green traffic engineering, following parameters should be handled at first: 1. The energy consumption of link: The power consumption of each device is generally composed of two parts: the basis of power consumption and the changes of power consumption. The basis of power consumption is the fixed energy consumption, including fan. The changes of power consumption mainly depends on the forwarding process of increased and decreased traffic. This information can be carried in the link states of OSPF, called as "Energy consumption of Link TLV". 5. OSPF Extensions 5.1. Energy consumption of Link TLV [RFC3630] and [RFC5786] define extensions of OSPF to support MPLS TE. New TLVs should be added to OSPF TE LSAs to support MPLS green TE. Energy consumption of Link TLV: The "Energy consumption of Link TLV" will be represented as one expended sub-TLV of link-TLV. And the type of this sub-TLV is TBD, and its length is 4, and it is used to represent the energy will be consumed by the link which unit is Watts. Yan, et al. Expires August 22, 2013 [Page 4] Internet-Draft OSPF for Green TE February 2013 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(TBD) | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Energy consumption of link | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6. Enhanced CSPF Algorithm for Green TE When support green TE, there should be two mode for MPLS TE path calculation: Metric First and Energy-consumption First. The mode Metric First is compatible with the existing path calculation which will calculate the path with the minimum metric when CSPF algorithm is done. The mode Energy-consumption First is used for green TE path calculation. When the ingress node of MPLS domain calculates the LSP forwarding path, the data from the Energy consumption of link sub-TLV will take part in the CSPF calculation. When CSPF can calculate multiple paths from the ingress node to egress node, the power consumption of each path should be calculated and the path with the minimum energy consumption will be chosen. 7. Security Considerations This document does not introduce any further security issues other than those discussed in [RFC3630] and [RFC5786]. 8. IANA Considerations The types of energy TLV represented in this draft are to be registered with IANA. 9. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3630] Katz, D., Kompella, K., and D. Yeung, "Traffic Engineering (TE) Extensions to OSPF Version 2", RFC 3630, September 2003. [RFC5786] Aggarwal, R. and K. Kompella, "Advertising a Router's Local Addresses in OSPF Traffic Engineering (TE) Extensions", RFC 5786, March 2010. Yan, et al. Expires August 22, 2013 [Page 5] Internet-Draft OSPF for Green TE February 2013 Authors' Addresses Gang Yan Huawei Technologies Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: yangang@huawei.com Jianjun Yang Huawei Technologies Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: jack.yangjianjun@huawei.com Zhenbin Li Huawei Technologies Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: lizhenbin@huawei.com Yan, et al. Expires August 22, 2013 [Page 6]