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Private MIBs and Standard MIB Support
300861-C Rev. 00 3-3
Understanding MIB Objects
RFC 1155 (Structure and Identification of Management Information for
TCP/IP-based Internets) describes the layout and encoding of exchanged data
objects. The SMI uses the ISO standard ASN.1 (Abstract Syntax Notation One) to
define a method for describing a hierarchical name space for managed
information.
Each object has:
• A name (also referred to as an Object Identifier [OID]).
• A syntax and an encoding. In addition to the basic integer and octet string data
types, several special types are defined (for example: IP Address, Network
Address, Counter, Gauge, TimeTicks). RFC 1212 (Concise MIB Definitions)is
an easier-to-read form used in most standard MIBs today. It defines the private
enterprise MIB.
Restrictions on Standard MIBs
The SNMP agent does not use all objects in the supported standard MIBs. Also,
there may be restrictions on the standard MIB objects that are supported. This
section lists the supported standard MIBs and outlines the differences between the
RAC parameters and specific standard MIB objects. Table 3-1 lists the supported
standard MIBs.
RFC 1213 MIB-II Restrictions
The RAC supports RFC 1213’s system, interfaces, at, ip, icmp, tcp, udp,andsnmp
groups. It does not support the egp group. In addition, some individual objects
have the restrictions outlined in Table 3-2.