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思博伦TestCenter测试方法.pdf

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    Chapter 4: Test Methodology www.spirentcampus.com
    Topic Overview  Types of Tests  What is Performance Testing?  BMWG – Benchmarking Methodology Working Group  Core RFCs (1242, 2544, 2285, 2889)  Evolution of Switching Technology  Ethernet, VLAN, IPv4, QoS Test Methodologies  Test Objectives  Test Parameters  Test Procedures  Reporting Formats 2
    Types of Tests  In exercising and validating all the characteristics of a DUT, there are four different types of tests to run:  A Conformance test consists of verifying the device’s behavior in correspondence with the standards, conventions, rules.  A Functional test consists of verifying that the device does everything it is supposed to do (i.e., protocol support, filters, management, etc.).  A Performance test consists of “stress testing” the device to see how it behaves under loaded conditions.  A Passive test consists of Protocol analysis. This can be accomplished either intrusively or non-intrusively. 3
    Conformance Testing  Validating adherence to a standard  Tests all facets of the RFCs  Concepts developed by Telcordia – Bell Standard  Hundreds of individual tests  Identifies the sections of the RFC that are being tested  Assures correct handling of error conditions  Should reveal how the “SHALLs” and “MAYs” are implemented (i.e., optional elements)  Subset of these tests can be used as manufacturing test (e.g., does a specific board meet a physical interface standard?) 4
    Functional Testing  Validates “system” components  Internal management functions  Control plan and data plane functions  Proprietary functions between systems (e.g. encapsulation, trunking protocols)  Testing of the correct implementation and operation of a communications protocol  Typically less rigorous than a conformance test  Verifies interaction between multiple functions  Negative Testing (e.g., introduce impairments to a stable device or network) 5
    Functional Testing – Negative Testing Introduce impairments to a stable device or network:  Route or link flapping  Invalid routes  Malformed packets  Invalid policies  Lost keep-alives 6
    Performance Testing  What is performance testing?  Setting an expectation of the device’ functionality  It could be said, “there are 3 levels of performance testing.”  Performance testing (set a benchmark under low load conditions)  Load testing (how it functions under normal operating conditions)  Stress testing (diagnose problems under heavy loads)  Keep it realistic.  A broad distribution of source and destination addresses.  A mix of packet sizes and types.  The bandwidth characteristics of realistic traffic.  Different ratios of unicast and multicast traffic.  Many different streams and conditions that force prioritization (for QoS) 7
    Who Needs Performance Testing?  Test setups and methodologies were derived from the following RFCs:  RFC 1242 “Benchmarking Terminology for Network Interconnection Devices”  RFC 2544 “Benchmarking Methodology for Network Interconnection Devices”  RFC 2285 “Benchmarking Terminology for LAN Switching Devices”  RFC 2889 “Benchmarking Methodology for LAN Switching Devices” Performance Tester Traffic Generation: X Frames Transmitted Device Under Test (DUT) Traffic Analysis: Y Frames Received 8
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