HP StorageWorks 2/140 FW 08.01.00 McDATA E/OS SNMP Support Manual (620-000131- - Page 16

Introduction to SNMP 1 retrieved and/or modified by the manager, and it is the agent's job to return the requested object's value. Within the agent is at least one, maybe several, collections of definitions called Management Information Bases (MIBs). MIB provides each OID with a readable label and other parameters. The MIB acts as a dictionary that is used to assemble or interpret the SNMP messages. When an agent supports a standard MIB, it agrees to provide and make available the variables listed in the MIB. A MIB is an hierarchical tree of groups and variables. Operators at a network management station enter a command with supported groups and variables from the MIB. NMS Read status information with GetRequest command or Set a variable to a value with SetRequest command Agent (Use MIB to identify variable) Managed Device MIB Variable a Variable b Variable c Variable d Variable e Variable f Variable g - Actual Variable (object) (x)y (x)y (x)y (x)y (x)y SNMPv3 Figure 1-2 Retrieving or Setting Values Using MIBs The E/OS provides additional level of security in the existing SNMP framework by supporting the SNMPv3, which supplements the SNMPv2c framework by providing security for messages and explicit access control. The E/OS also supports SNMP versions 1 and 2, 1-4 E/OS SNMP Support Manual