Lucent Technologies PortMaster - Manual (Page 52)

Configuring SNMP
3-14 PortMaster Configuration Guide
The SNMP agent returns values for management information base (MIB) variables that
can be changed or queried by the SNMP manager. The agent gathers information from
the MIB, which resides on the target device. MIB information can include device
parameters and network status. The agent is capable of responding to requests to get or
set data from the manager.
PortMaster products support MIB II variables as specified in RFC 1213, along with a
MIB specific to PortMaster products. SNMP management can be enabled for any
PortMaster. Lucent Remote Access ships configuration files compatible with various
network management packages along with the PMconsole software.
About the livingston.mib Definition File
livingston.mib is the MIB definitions file that SNMP tools can read and use to query
SNMP agents for information about PortMaster products. The PortMaster extensions to
the MIB are located in the latter part of this file under Livingston Extensions.
The livingston.mib file can be found in the SNMP directory of the ComOS software, or
on the World Wide Web at: http://www.livingston.com/Forms/one-click-
dnload.cgi. To view the file with a browser, scroll down to the Miscellaneous drop-
down menu, select SNMP—Livingston MIB, and then click the Download button.
When the Download page appears, click the livingston.mib link.
Examining the MIB Structure
The entire management information base (MIB) hierarchy can be represented by a tree
structure. In this representation, the unnamed “root” of the tree divides into the
following main branches:
• Consultative Committee for International Telegraph and Telephone (CCITT)
• International Organization for Standardization (ISO)
• ISO/CCITT
Each branch and sub-branch in the tree structure is known as an object, and each
object is represented by an object name and an object identifier (OID). Figure 3-2
traces the “path” from the ISO branch of the MIB to the Livingston MIB.
OIDs provide compact representations of object names. An OID shows the position of an
object in the MIB hierarchy. As shown in Figure 3-2, the OID for the Livingston MIB is
1.3.6.1.4.1.307.