The Windows NT-based SNMP service includes MIB-II, based on RFC 1213, LAN Manager MIB-II, and Microsoft proprietary MIBs for DHCP, Internet Information Server, and WINS servers. Appendix C, "MIB Object Types for Windows NT," contains information about the Windows NT-based MIBs, and a description of each object in the MIB.
The Windows NT-based SNMP service supports multiple MIBs through an agent application programming interface (API). The separate extension-agent DLL is used to access the Windows NT-based MIBs. When the SNMP service is started, it loads the SNMP extension-agent DLLs. The extension-agent DLLs must be defined in the Registry in order to be loaded.
This use of DLLs in the SNMP service architecture allows new MIBs to be easily added. Microsoft and third-party developers can develop MIBs for new hardware and software components and easily integrate the new functionality by using SNMP.
The MIB name space assigned to Microsoft by the IETF starts at the node labeled 1.3.6.1.4.1.311. Microsoft has the authority to assign objects and OIDs to all objects that are developed below that node.
The following table identifies the Windows NT-based MIBs and top-most object (base object) from which all other objects in the MIB are derived. When the SNMP service is started, each extension-agent sends the OID for the base object in its MIB to the master agent program. This process identifies to the master agent the MIBs and managed objects that are actually installed on the computer.
Table 11.3 Base Object Identifiers
|
| Base object identifier (OID) |
| |
Internet MIB-II | iso.org.dod.internet. | 1.3.6.1.2.1 | Defines objects essential for either configuration or fault analysis. Internet MIB-II is defined in RFC 1213. | |
LAN Manager MIB-II | iso.org.dod.internet. | 1.3.6.1.4.1.77 | Defines objects that include such items as statistical, share, session, user, and logon information. | |
Microsoft DHCP server MIB | iso.org.dod.internet. | 1.3.6.1.4.1.311.1.3 | Contains statistics for the DHCP server, and DHCP scope information. | |
Microsoft Internet Information Server MIB | iso.org.dod.internet. private.enterprise. microsoft.software. iis | 1.3.6.1.4.1.311.1.7 | The FTP, Gopher, and HTTP server MIBs are derived from the Internet Information Server base object. | |
Microsoft WINS server MIB | iso.org.dod.internet. | 1.3.6.1.4.1.311.1.2 | Contains information about the WINS server, including statistics, database information, and push and pull data. | |