Cisco 11503 Administration Guide - Page 189

Chapter 5 Configuring Simple Network Management Protocol (SNMP) Management Information Base (MIB) Overview MIB Variables There are two types of MIB variables: • Scalar - Variables that define an object with a single representation. This means that the object describes a particular characteristic of the entire system. An example of a scalar variable is SysDescr, which provides a system-wide description of the CSS. • Tabular - Variables that define an object with multiple representations. This means that the object can have different values, depending on the qualifier. For example, one tabular object could show bytes per interface, temperature per board, or hits per service. As shown in Figure 5-2, a number is associated with a MIB object name. This number is called the object identifier (OID), and it uniquely identifies the MIB object in the MIB tree. (The dotted lines represent other branches not relevant to this discussion.) For example, note in Figure 5-2 that the MIB object labeled arrowpoint (368), which contains the MIB objects specific to the CSS, can be labeled: iso.organization.dod.internet.private.enterprises.cisco.ciscoMgmt. arrowpoint or 1.3.6.1.4.1.9.9.368 MIB Extensions (Enterprise MIBs) The MIB tree has a special branch set aside for specific vendors to build their own extensions; this special branch is called the Enterprise MIB branch. The CSS MIBs are included in the following directories and ZIP files on the CSS disk: • SNMPv1 MIBs - /mibs/v1/cssmibsv1.zip • SNMPv2C MIBs - /mibs/v2/cssmibsv2.zip The MIB files in this branch comprise the CSS Enterprise MIBs (the highlighted MIB identifier in Figure 5-2). The enterprise MIB files are categorized along functional boundaries. For a list of MIB branches under the CSS Enterprise MIB, see the "CSS MIBs" section. OL-5647-02 Cisco Content Services Switch Administration Guide 5-7