# Supported MIBs

The following table describes the supported MIBs:4

MIB | Description | Ownership | Installed by
--- | --- | --- | ---
Trunk | Represents DS1 (and higher speed) lines and is defined by the IETF. Also called the DS1 MIB. | RFC-2945 (obsolete RFC-1406) | OAM API
Chassis | Represents the PCI buses and slots, bus segments, and boards in the chassis. The Chassis MIB detects the presence of each board and monitors its operational status. | Proprietary | OAM API
Software Revision | Tracks the versions of all NMS software installed in a chassis. The MIB tracks each NMS package, the files in each package, and service packs and patches applied to each package. The Software Revision MIB is modified whenever packages, service packs, or patches are installed or removed. | Proprietary | OAM API
OAM Database | Represents the contents of the NMS OAM database: board, board plug-in, and extended management component (EMC) settings. The contents of the NMS OAM database can be modified using this MIB. | Proprietary | OAM API
RTP | Allows monitoring of the managed objects of the RTP system (configuration is not allowed). Displays only RTP session parameters and statistics using the NMS MSPP service. This subagent does not allow row creation or parameter modification. For more information about the RTP MIB, refer to the Fusion Developer's Manual. | RFC-2959 | Fusion API

NMS is assigned a namespace under the Enterprises MIB. The OID for the NMS MIB is 1.3.6.1.4.1.2628. The Chassis MIB, the Software Revision MIB, the OAM Database MIB, and future private MIBs reside under this OID.

The following illustration shows the SNMP subagents with their major tables. The MIBs that are currently implemented are shown in grey:

The NMS subtree consists of the following MIBs:

MIB | Description
--- | ---
Directory | Describes all MIBs defined by NMS.
Common | Contains general-purpose MIBs, applicable across multiple product lines.
Specific | Contains specialized MIBs for individual products.
Experimental | Contains MIBs that are under development and test.

MIB description files for the NMS SNMP subagents can be found in the \nms\ctaccess\doc directory. The following table lists the MIB description files:

MIB description file | Description
--- | ---
NmsChassis.mib | Chassis MIB
NmsOamDatabase.mib | OAM Database MIB
NmsSmi.mib | NMS hierarchy MIB
NmsSoftRev.mib | Software Revision MIB
NmsTrunk.mib | Trunk MIB (DS1)
NmsRtp.mib | RTP MIB (installed by Fusion package)

These text files require other MIB description files documented in RFCs (such as SNMPv2-TC, SNMPv2-CONF, SYSAPPL-MIB). These files can be easily found on the web. The NMS Communications hierarchy shown in the previous illustration is defined in the NMS-SMI MIB.