SNMP Introduction
©2008 Allied Telesis Inc. All rights reserved.
54.4
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
Software Version 5.2.1
Structure of Management Information
The structure of management information (SMI) defines the schema for a collection of
managed objects residing in a virtual store called the management information base (MIB). The
information in a MIB includes administrative and operational configuration information, as well
as counters of system events and activities.
The MIB is organized into a tree-like hierarchy in which nodes are each assigned an identifier
consisting of a non-negative integer and an optional brief textual description.
Each managed object is represented by a leaf node and is defined by its name, syntax, access
mode, status and description. It can also be specifically identified by its unique position within
the tree. This position is expressed as a series of dot-delimited sub-identifiers that start at the
root node and end in the sub-identifier at the particular object’s leaf node. For example, in
Figure 54-2
the object named interfaces would be uniquely identified by the string of individual
sub-identifiers, 1.3.6.1.2.1.2.
Figure 54-2:
Top levels of the Internet-standard Management Information Base (MIB)
Objects defined in the Internet-standard MIB (MIB-II) reside in the mib(1) sub-tree.
system (1)
interfaces (2)
at (3)
ip (4)
icmp (5)
tcp (6)
udp (7)
egp (8)
cmot (9)
transmission (10)
snmp (11)
mib-2 (1)
internet (1)
enterprises (1)
directory (1)
private (4)
experimental (3)
mgmt (2)
mib (1)
dod (6)
member-body (2)
standard (0)
registration-authority (1)
identified-organisation (3)
iso (1)
ccitt (0)
root
joint-iso-ccitt (2)
SNMP2
dot1dBridge (17)
host (25)
...
...