The article explains how to design a test plan for a feature on a network device. A feature can be an implementation of a protocol like STP, on a switch or RIP, OSPF on a router. It can also be a functionality which is specific to the product. For ex: implementation of port-security on a switch, or Access control lists on a router. The first step to understand is the scope of testing activity. If it is a protocol, the scope can be to test conformance and functionality. If it a specific feature, the scope can be functionality. Once the scope is identified, the relevant documentation should be used for designing the test plan. For protocol testing, relevant documentation include RFC, IEEE, Design Document. For a feature testing, the design document is required. The test plan is prepared with the documents as reference.
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