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The Heritage of DEN Classes
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By way of their respective backgrounds, CIM and X500 are complementary CIM's roots are in desktop management While the DMTF (CIM's sponsoring organization) is preoccupied with computer platform hardware and software, CIM has been developed to handle such things as PCs, disks, files, NICs, databases, operating systems, and the like In contrast, X500's focus has been primarily on people, organizations, and places Neither technology, however, has focused on network infrastructure That was left to SNMP, which is a closed management protocol and not a directory service This heritage can be seen in the depiction of DEN v30 schema in Figure 2-2
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Figure 2-2: The DEN information model at the highest level of abstraction The lineage of DEN's classes isn't quite so orderly as illustrated in Figure 2-2 Specifically, DEN extends several CIM classes to realize the physical characteristics particular to network devices One case of this is the NetworkASIC class, an enhanced DEN base class that extends the Chip class from the CIM schema NetworkASIC has attributes to accommodate the special data needs of network devices, such as handling fast switching rather than just modem communication This enhancement of CIM classes makes more sense than creating a separate class for network device hardware apart from computer platform hardware After all, whether it's a PC or a router, hardware is by and large still hardware
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Inside a DEN Class
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All DEN classes share a common format The classes might behave differently or contain different types of information, but schematically they're laid out the same way, under one set of taxonomic rules To be DEN compliant, a base class must define the elements in Table 2-2 Table 2-2: Generic Layout of a DEN Class
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DEN Class Element
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Definition
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Description
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A text statement defining the purpose of this class
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Type OID Derived From Possible Superiors Auxiliary Class
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Type of class: abstract, structural, container, or auxiliary Object Identifier, a unique number identifying this object The superclass for this class A list of classes that may serve as a parent of instances of this class A class used to bind one class of objects to another for example, to bind hostConditionAuxClass and routeConditionAuxClass, together, to the policyCondition structural class List of attributes this class must contain List of attributes this class may contain List of associations and/or aggregations defined for this class
Must Contain May Contain Relationships
The four types of DEN classes abstract, structural, container, and auxiliary define what the classes can do The most important distinction is that an abstract class cannot be directly instantiated (used); it exists only to serve as a parent of other classes An abstract class holds no useful information itself A container class exists only as a collection of other objects In other words, its definitions can be referenced only by those classes it contains, not by outside classes Auxiliary classes are used to include their attributes with the attributes of another class An auxiliary class can be created once and referred to by separate classes The vast majority of DEN classes are structural classes; they're the ones that do the actual work OIDs are widely used as unique identifiers in computing architectures Perhaps the best known example is the use of OIDs to identify SNMP Management Information Bases (MIBs), software agents that sit on managed devices to collect information By convention, all MIB OID numbers begin with the root notation 136121 The ISO administers a regimented OID numbering scheme whereby computer systems should never be confused by duplicated numbers It's a way to keep messages straight At this writing, the OID root for DEN directories has yet to be assigned, but it's likely they'll begin with the notation 13611 the ISO generic root number for directories The fifth digit (the second 1) denotes that the numbered entity is a directory For example, The OID for a Cisco directory might be 136113 (In case you're wondering, the 2 in the root notation for MIBs stands for management, as in "systems management") The DEN specification provides a long list of attributes for use with objects Where DEN classes are placeholders of information, the DEN attributes are used to express actual informational values For example, a DEN attribute called NumberOfUsers defines the number of user sessions an operating system is actually handling at any given moment Table 2-3 shows the layout of DEN attributes Table 2-3: Layout for DEN Attribute Definitions
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