基于软件定义网络的网络测试工具
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"SDN网络测试工具"
SDN（Software Defined Network，软件定义网络）是一种革命性的网络架构，它能够将网络控制平面和数据平面分离，实现网络控制的集中化和自动化。基于SDN，我们可以开发出更加智能、灵活和高效的网络测试工具。
SDN的核心思想是将网络控制平面和数据平面分离，将网络控制功能从网络设备中分离出来，并将其集中到一个中央控制器上。这样，网络管理员可以通过中央控制器来控制和管理整个网络，实现网络的自动化和智能化。
在SDN架构中，OpenFlow是一个开放的标准，提供了一组标准化的软件接口来控制数据包的路由和转发。OpenFlow可以实现硬件的控制，实现网络设备的自动化配置和管理。
基于SDN的网络测试工具可以支持应用流量测试，实现网络的性能测试和优化。这种工具可以模拟不同类型的网络流量，测试网络的性能和可靠性，并提供详细的测试报告和分析结果。
SDN网络测试工具的优点是：
1. 高度灵活性：SDN网络测试工具可以模拟不同类型的网络流量，测试网络的性能和可靠性。
2. 高度自动化：SDN网络测试工具可以实现网络的自动化配置和管理，减少人工干预。
3. 高度可靠性：SDN网络测试工具可以提供详细的测试报告和分析结果，帮助网络管理员快速定位和解决网络问题。
SDN网络测试工具的应用场景包括：
1. 网络性能测试：SDN网络测试工具可以测试网络的性能和可靠性，帮助网络管理员快速定位和解决网络问题。
2. 网络优化：SDN网络测试工具可以提供详细的测试报告和分析结果，帮助网络管理员优化网络的性能和可靠性。
3. 网络安全测试：SDN网络测试工具可以模拟不同类型的网络攻击，测试网络的安全性和可靠性。
基于SDN的网络测试工具可以提供一种灵活、自动化和可靠的网络测试解决方案，帮助网络管理员快速测试和优化网络的性能和可靠性。
Knowledge Points：
1. SDN（Software Defined Network，软件定义网络）
2. OpenFlow（开放标准）
3. 网络控制平面和数据平面
4. 中央控制器
5. 网络自动化和智能化
6. 网络性能测试
7. 网络优化
8. 网络安全测试
详细知识点：
1. SDN的架构和原理
SDN的架构主要包括三个层次：控制平面、数据平面和应用平面。控制平面负责控制和管理网络，数据平面负责数据的转发和路由，应用平面负责提供网络服务。
2. OpenFlow的原理和应用
OpenFlow是一个开放的标准，提供了一组标准化的软件接口来控制数据包的路由和转发。OpenFlow可以实现硬件的控制，实现网络设备的自动化配置和管理。
3. 网络测试工具的类型和应用
网络测试工具可以分为两类：基于SDN的网络测试工具和传统的网络测试工具。基于SDN的网络测试工具可以提供一种灵活、自动化和可靠的网络测试解决方案，而传统的网络测试工具则需要人工干预和配置。
4. 网络性能测试的方法和技术
网络性能测试的方法包括：网络延迟测试、网络带宽测试、网络可靠性测试等。这些方法可以帮助网络管理员快速测试和优化网络的性能和可靠性。
5. 网络优化的方法和技术
网络优化的方法包括：网络拓扑优化、网络流量优化、网络资源优化等。这些方法可以帮助网络管理员快速优化网络的性能和可靠性。
COL 12(Suppl.), S10602(2014) CHINESE OPTICS LETTERS April 30, 2014
1671-7694/2014/S10602(4) S10602-1 © 2014 Chinese Optics Letters
The network test tools based on SDN
Song Yang (杨 松)
1,2*
, Xiaoguang Zhang (张晓光)
1,2
,
Lixia Xi (席丽霞)
1,2
, and DongHe Zhao (赵东鹤)
1,2
1
State Key Laboratory of Information Photonics and Optical Communications, Beijing
University of Posts and Telecommunications, Beijing 100876, China
2
Institute of Information Photonics and Optical Communication, Beijing University of
Posts and Telecommunications, Beijing 100876, China
*Corresponding author: y14681@sina.com
Received October 1, 2013; accepted October 13, 2013; posted online February 28, 2014
Based on Software dened network (SDN), we brought up the NetWork Test Tools for communication
networks. It is an innovative application of SDN, which can support the application traic test.
OCIS codes: 060.4250060.4510.
doi: 10.3788/COL201412.S10602.
OpenFlow
[1]
is an open standard based on SDN that pro-
vides a set of standardized software interfaces to control
packets routing and forwarding. It can achieve its real-
ization by hardware. The essence of OpenFlow can be
concluded as follows: 1) An Openow switch separates
the two functions (fast packet forwarding and high-level
routing decisions) of a classical router or switch into
OpenFlow Switch and OpenFlow controller; 2) Switch
the “Optimization of one node” to the “Optimization
of all”; 3) Concentrical management and standard in-
terfaces make maintenance easier and the eiciency of
synchronization higher. For now, OpenFlow already
has many applications—for example, Packet and Cir-
cuit Network Convergence with OpenFlow
[2]
.This paper
is an enhancement of the application traic test based
on SDN, as we have made the test tools a NetWork,
which is an innovation of SDN and OpenFlow. The im-
provement we made here is to connect large number
of equipments and hand them over to one Controller,
which forms our NetWork Test Tools, service users and
equipments under tests can be easily accessed to. The
main functions that NetWork Test Tools provide in-
clude the following: 1) Providing dierent networking
environment according to test requirement; 2) WEB
access for users to sign their tasks; 3) Controller asks
the virtual machine to congurate resources according
to demands and analysis into mini-tasks then boot on-
test equipments; 4) Virtual machines report resource us-
age and test index to the controller, and the controller
adjusts resources to achieve the highest eiciency with
minimum resources; 5) Test dispatch and results report.
The NetWork test tool software platform (Fig. 1) in-
cludes the following: 1) Maintenance platform mainly
provides routine monitoring of optical network physical
parameters, online monitoring, failure awareness, net-
work planning; 2) Protocol fuzzy test and telecommuni-
cation scenario performance test, we designed Network
stream engine (NSE) tools module; 3) Environment
(test bed) management platform; 4) Automation engine
and hardware; 5) Extended development interface and
third-parts integration engine.
The NetWork tools provide full-day automatic test
service by providing automation interface. With test
NetWork, service users only need to select the appropriate
test protocol. The automation engine automatically
extracts the task, requires environment, dispatches sub-
tasks and accomplishes the corresponding tests and re-
ports the results. Meanwhile, as test tools are added up
to network under test, we can upgrade and monitor test
tools in a centralized way, which leads to a higher ef-
ciency of testing and maintenance. With syslog journal
recording and TelNet management, we can easily debug
when a problem occurs. The hardware is mainly based on
servers or PCs (virtual machines). Each hardware with an
OpenFlow control module and test engine runs under the
controller’s command (Fig. 2). For network test, the test
bed management is very important. The test bed control
module provides dynamic optical networks function. Net-
Work tools may run multiple test tasks at the same time,
and each case with dierent scenario will be mapped to dif-
ferent devices in the bed. Since test beds consist of dier-
ent communication equipments such as optical networks,
switches and routers, if we organize test beds independent-
ly, the equipments resources will be tremendously wasted.
The best way to solve this problem is to connect all the
equipments to the switches (layer 1 or layer 2 switch)
to form a big equipments-resource pool. On the stage of
environment preparing, the equipments resources are dy-
namic networked and become non-interfering local net-
work. It makes full use of equipments resources with re-
duced investment and high eiciency parallel execution of
the cases.
The Tools provide the visual management of network
system topology. Through dragging and automatic dis-
covery, it can nd all the nodes (Agent) in the Net-
Work quickly. Besides, the telemanagement function of
appropriate agents can oer clients online monitoring
of tested equipments and NetWork nodes, which is an
excellent working experience for clients. The manage-
ment software of the tools provide several functions
for physical machine such as deployment, drag, zoom,
search, lter, oine conguration and states’ display.
It can operate physical machine plug-in with start,
stop, statistics gather, log viewer and graphic functions.
With high-level automation control, it is very simple to
do complex test with the NetWork tools. For complex
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