How do Sets (write operations) work?
There are five passes involved when processing a Set request: • Each variable in the variable binding list of the received PDU is checked to guarantee that each object is accessible and/or creatable, and writable. The test method for each object is called to verify the object’s instance, size/range, and value. If an object is supported in more than one subagent, the master agent calls the Test method routine in each subagent in priority order, and the first to return a successful status will receive the Set method call in Pass 3 or 4. The variable binding list is parsed to construct a list of simultaneous Set operations for groups of objects. • This pass verifies that all required objects within a group have specified or default values. It also insures that all required values meet the relational constraints specified in the MIB. • Sets are performed on all of the individual objects that can be reversed in case something goes wrong. • Sets are performed on all the remaining individual
