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データセンタネットワークのオーバーレイ:促進要因と課題

Overlays for Data Center Networking: Drivers & Challenges

Vol. 13, No. 3, March 2015

 

出版社 出版年月電子媒体価格ページ数
Heavy Reading
ヘビーリーディング社
2015年3月US$3,995
エンタープライズライセンス
18

サマリー

米国調査会社ヘビーリーディング社の調査レポート「データセンタネットワークのオーバーレイ:促進要因と課題」は、通信会社のデータセンタドメインのオーバーレイネットワークの市場可能性と影響について、採用を促進する様々な要因や主な課題などを分析している。通信会社のデータセンタオペレータのオーバーレイネットワークに関する動向や期待、計画などについての洞察も記載している。

EXECUTIVE SUMMARY  (エグゼクティブサマリー)

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.

 

Deliverables

  • 18 pages of analysis of overlay networking's potential impact on the telco data center networking domain, including the various drivers that support its deployment
  • Key insight into the current thinking of telco data center operators as regards their attitudes, expectations and plans for overlay networking
  • Breakdowns of the use cases that are driving overlay networking within the telco data center, as well as some of the challenges it presents
  • In-depth profiles of 10 leading overlay networking solution suppliers, including details of their approaches, solutions and partnerships

 



目次

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.
 

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プレスリリース

Are Overlays the Answer for Telco Data Centers?

Heavy Lifting Analyst Notes
Roz Roseboro, Senior Analyst

3/16/2015

Telco data center operators have recently begun to consider how to bring the benefits of virtualization to the networking domain. OpenStack has been rapidly gaining traction, but concerns remain that it lacks some of the functionality required to support highly available and highly scalable networks. Numerous vendors have taken up the challenge of filling that gap.

In my recently published report, "Overlays for Data Center Networking: Drivers & Challenges," I explore some of the expected benefits and perceived challenges surrounding overlay networking. It highlights and analyzes the potential impact overlay networking will have on the telco data center networking domain, including the various drivers that support its deployment. It also provides analysis of some of the main challenges that overlay networking can introduce into the environment. It also analyzes the strategies of ten key overlay networking technology suppliers.

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 being 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.

— Roz Roseboro, Senior Analyst, Heavy Reading

 

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