FW 08.01.00 McDATA E/OS SNMP Support Manual (620-000131-630, November 2005)

1-4

E/OS SNMP Support Manual

Introduction to SNMP

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.

Figure 1-2 Retrieving or Setting Values Using MIBs

SNMPv3

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,

Variable a

Variable b

Variable c

Variable d

Variable e

Variable f

Variable g

Agent

(Use MIB to

identify variable)

Managed

Device

Read status information

with GetRequest command

Set a variable to a value

with SetRequest command

NMS

MIB

Actual

Variable (object)

(x)y