Communication within Clouds: Open Standards and Proprietary

Protocols for Data Center Networking

Conference: Communications Magazine, IEEE  (Volume:50 ,  Issue: 9 )

Authors: Sher Decusatis, C.J. ; Carranza, A. ; Decusatis, C.M.

1

Introduction

2來源資料： http://en.wikipedia.org/wiki/Cloud_computing

SPANNING TREE PROTOCOL ANDMULTICHASSIS LINK AGGREGATION

• Spanning Tree Protocol (STP)– layer 2 switching protocol used by classical

Ethernet that ensures loop-free network topologies by always creating a single path tree structure through the network.

• Link Aggregation Group (LAG)– allows two or more physical links to be bonded

into a single logical link, either between two switches or between a server and a switch.

3

TRILL

• TRILL is the Transparent Interconnection of Lots of Links.

• TRILL runs a link state protocol between devices called routing bridges (RBridges).

• TRILL Header

4

“Outer Header”Hop-By-Hop Header

TRILL Header “Inner Header” original Ethernet Frame Including Ethernet Header

payload

TRILL 原先封包樣子

TRILL(cont.)

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L2 L3 payload

RB5 MAC RB2 MAC RB5 MAC RB2 MAC MAC Dst MAC src payload

MAC Dst MAC src payload

Ethernet Fabric

• 在 Layer 2 資料鏈結層施行 Layer 3 網路層的路由機制，支援多條傳輸路徑同時運作，讓內網流量快速水平流通，打造低延遲網路架構。

• Ethernet Fabric 支援伺服器之間的水平傳輸 流向

6來源資料： http://www.ithome.com.tw/node/68809

Ethernet Fabric(cont.)

7來源資料： http://www.ithome.com.tw/node/68809

Ethernet Fabric(cont.)

8來源資料： http://www.ithome.com.tw/node/68809

Ethernet Fabric(cont.)

9來源資料： http://www.ithome.com.tw/node/68809

SOFTWARE-DEFINED NETWORKINGAND OPENFLOW

• The OpenFlow standard moves the network control plane into software running on an attached server or network controller. The flow of network traffic can then be controlled dynamically, without the need to rewire the data center network.

• In cloud computing environments, OpenFlow improves scalability and enables multi-tenancy and resources pooling, and will likely co-exist with other Layer 2/3 protocols and network overlays for some time.

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Conclusion

• In this article, we have presented an overview of layer 2 and 3 protocols that may be used to address the unique requirements of a highly virtualized cloud data center.

• That enhance features of a flattened layer 2 network (TRILL) or have the potential to enhance future systems (SDN).

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