Internet DRAFT - draft-li-ospf-ext-green-te
draft-li-ospf-ext-green-te
Network Working Group G. Yan
Internet-Draft J. Yang
Intended status: Standards Track Z. Li
Expires: April 17, 2014 Huawei Technologies
October 14, 2013
OSPF Extensions for MPLS Green Traffic Engineering
draft-li-ospf-ext-green-te-01
Abstract
The energy-saving is one important topic in the world, and now most
of technologies for energy-saving focus on the hardware design
instead of the energy saving design based on the whole network. This
document proposes OSPF extensions to synchronize the energy
consumption parameter of each node in the network. These parameters
can be used for the energy saving design.
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
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on April 17, 2014.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Overview of MPLS Green Traffic Engineering . . . . . . . . . 3
3. Energy-saving Design of Network Nodes . . . . . . . . . . . . 3
4. Parameters of Energy-saving Design . . . . . . . . . . . . . 3
5. OSPF Extensions . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Energy consumption of Link TLV . . . . . . . . . . . . . 4
6. Security Considerations . . . . . . . . . . . . . . . . . . . 4
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
8. Normative References . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
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. As the SDN solution develop, the MPLS TE LSP path can be
calculated in a central controller to achieve better path
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optimization result based on more information collected and the
states of all LSPs in the network.
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.
4. Algorithms should be extended to consider these energy-related
parameters to calculate paths with the power consumption constraint.
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.
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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.
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. Security Considerations
This document does not introduce any further security issues other
than those discussed in [RFC3630] and [RFC5786].
7. IANA Considerations
The types of energy TLV represented in this draft are to be
registered with IANA.
8. 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.
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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
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