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データセンター・ネットワーキング向けオーバーレイ:促進要因と課題

Overlays for Data Center Networking: Drivers & Challenges

発行 Heavy Reading 商品コード 325914
出版日 ページ情報 英文 18 Pages
納期: 即日から翌営業日
価格
こちらの商品の販売は終了いたしました。
データセンター・ネットワーキング向けオーバーレイ:促進要因と課題 Overlays for Data Center Networking: Drivers & Challenges
出版日: 2015年03月13日 ページ情報: 英文 18 Pages

当商品の販売は、2020年01月14日を持ちまして終了しました。

概要

データセンターのうちサーバー・ドメインでは仮想化はすでに標準的であり、ストレージ・ドメインでも仮想化が進展しつつあります。しかし、ネットワーク・ドメインの仮想化は近年になってようやく着手されたばかりです。オーバーレイは、物理的ネットワークを簡略化し、バーチャルマシン (VM) や他のデバイスへの接続をより迅速にしたものです。物理的デバイスへのパスを提供するかわりに、オーバーレイではVXLAN・NVGREなどのプロトコルを用いるトラフィックを簡略化して、物理的ネットワークを短絡できるので、オペレーターはマルチテナント・クラウドサービスに対するサポートを改善できます。もう一つの促進要因はネットワーク仮想化機能 (VNF) で、汎用サーバーを使いながら、専用プラットフォームをVFN (仮想ネットワーク機能) の形でサポートでき、結果としてネットワークの弾力性や拡張性が改善されます。以上のような利点にも関わらず、オーバーレイのデータセンターへの導入はさらなる複雑化につながる、とみなされています。運営コスト引き下げ・効率改善の程度や、物理的ネットワークの重要性に関して、まだ議論がつきていないのが現状です。

当レポートでは、通信企業のデータセンター・ドメインにオーバーレイ・ネットワーキングを導入した場合の潜在的な影響度について分析し、導入促進につながる様々な要素や、導入時に検討を要する諸問題、オペレーター側が現時点で重要視または懸念している事項、オーバーレイ・ネットワーキングに関する考え方・期待・計画などについて調査・考察しております。

第1章 イントロダクションと主な分析結果

  • 主な分析結果
  • オーバーレイ・ネットワークの定義
  • 分析の範囲・構造

第2章 データセンターにおけるオーバーレイ・ネットワーキングの促進要因

  • クラウド/マルチテナント機能
  • 仮想ネットワーク機能 (VNF) の弾力性/モビリティ
  • データセンターの外側への仮想ネットワークの拡張

第3章 オーバーレイに関する課題

  • 管理のし易さ
  • 物理的ネットワークとのインターフェース

第4章 ベンダーの比較

第5章 オーバーレイ・ネットワーク・ソリューションのサプライヤー

  • Akanda Inc
  • Cisco Systems Inc.
  • CPlane Networks Inc.
  • Hewlett-Packard Co.
  • Huawei Technologies Co. Ltd.
  • Juniper Networks Inc.
  • Midokura Inc.
  • Nuage Networks (Alcatel-Lucent)
  • PLUMgrid Inc.
  • VMware Inc.

付録A:著者について

付録B:法的免責事項

図表一覧

目次

Virtualization has long been common within the server domains of data centers, and is increasingly so in the storage domain. Only recently, however, have operators considered virtualizing in the network domain. Networking is a complex endeavor, and tools such as OpenStack are generally perceived to lack some of the functionality required for highly available, highly scalable networks.

Overlays have been proposed as a way to provide the connectivity needed to support the networking needs within the data center. They abstract the details of the physical network, making it much faster to connect virtual machines (VMs) and other devices. Rather than provision paths on physical devices, overlays encapsulate traffic using protocols such as VXLAN and NVGRE to tunnel across the physical network. These newer protocols allow operators to move beyond the limitations of VLANs, which only support 4,096 virtual networks, so they can better support multi-tenant cloud services.

Another driver, which is not as clearly understood, is the emergence of network functions virtualization (NFV). In NFV, functions that had previously resided on purpose-built, proprietary platforms will be supported on general-purpose servers in the form of virtualized network functions (VNFs). How these workloads will behave in terms of elasticity and mobility is still be determined, but overlays are seen as an effective approach to providing the flexibility they will need to manage VNFs. Overlay networks also make it easier to move workloads between and across data centers. By mapping VXLAN to MPLS paths, virtual private networks can be extended beyond the data center across the WAN.

Despite these potential benefits, overlays are often seen as introducing more complexity into the data center environment. Opinions vary as to how significant this issue is: Some argue that in the end, operational expense will decline, because less time will be spent managing the physical network; others contend that managing service performance will become more complicated from having two domains to consider. Even when overlays are present, the physical network will remain critical for ensuring service quality. Discussions with operators suggest that the benefits will ultimately outweigh these concerns, although it will take time for operations to get comfortable with the new approach.

‘Overlays for Data Center Networking: Drivers & Challenges’ analyzes the potential impact of overlay networking on the telco data center domain, including the various drivers that support its deployment, as well as the main challenges it presents. It also provides insight into the current thinking of telco data center operators as regards their attitudes, expectations and plans for overlay networking.

The report also profiles 10 leading overlay networking solution suppliers*, including details of their approaches, solutions and partnerships.

As shown in the excerpt below, overlay networking describes the creation of a virtual network that runs on top of a Layer 2 or Layer 3 physical network. Most often, overlays are used to connect VMs to each other. They are also used to connect VMs to gateways to the physical network including bare metal. Tunnels are used to transport payloads across an underlay (physical) network that has no visibility into or awareness of the traffic in those tunnels. Overlays are an attractive option to data center operators because they reduce the need for frequent modifications to the physical network while providing more agile deployment of networking resources.

Excerpt 1: Typical Fourth-Generation Multicore Processor

                        Source: Earlswood Marketing

Report Scope & Structure

Overlays for Data Center Networking: Drivers & Challenges is structured as follows:

Section I is an introduction to the report, including the key findings of our research.

Section II describes the main drivers behind demand for overlay networking.

Section III provides a look at the main challenges that must be addressed when considering deploying overlay networks.

Section IV provides a comparison of the main suppliers of overlay networking solutions.

Section V provides brief descriptions of the main suppliers of overlay networking solutions.

‘Overlays for Data Center Networking: Drivers & Challenges’ is published in PDF format.

OVERLAY NETWORKING SOLUTION SUPPLIERS (10)*

  • Akanda Inc.
  • Cisco Systems Inc. (Nasdaq: CSCO)
  • CPlane Networks Inc.
  • Hewlett-Packard Co. (NYSE: HPQ)
  • Huawei Technologies Co. Ltd.
  • Juniper Networks Inc. (Nasdaq: JNPR)
  • Midokura Inc.
  • Nuage Networks (Alcatel-Lucent)
  • PLUMgrid Inc.
  • VMware Inc. (NYSE: VMW)

Table of Contents

I. INTRODUCTION & KEY FINDINGS

  • 1.1. Key Findings
  • 1.2. Definition of Overlay Networking
  • 1.3. Report Scope & Structure

II. DRIVERS FOR OVERLAY NETWORKING IN THE DATA CENTER

  • 2.1. Cloud/Multi-Tenancy
  • 2.2. Elasticity/Mobility of VNFs
  • 2.3. Extending Virtual Networks Outside of the Data Center

III. CHALLENGES WITH OVERLAYS

  • 3.1. Manageability
  • 3.2. Interface to Physical Network

IV. VENDOR COMPARISONS

V. OVERLAY NETWORKING SOLUTION SUPPLIERS

  • 5.1. Akanda Inc
  • 5.2. Cisco Systems Inc.
  • 5.3. CPlane Networks Inc.
  • 5.4. Hewlett-Packard Co.
  • 5.5. Huawei Technologies Co. Ltd.
  • 5.6. Juniper Networks Inc.
  • 5.7. Midokura Inc.
  • 5.8. Nuage Networks (Alcatel-Lucent)
  • 5.9. PLUMgrid Inc.
  • 5.10. VMware Inc.

APPENDIX A: ABOUT THE AUTHOR

APPENDIX B: LEGAL DISCLAIMER

LIST OF FIGURES

  • Figure 1: Virtual Overlay Network
  • Figure 2: Overlay Suppliers That Also Offer Physical Networking Gear
  • Figure 3: Overlay Suppliers That Do Not Offer Physical Networking Gear