Dell PowerConnect Brocade M6505 Brocade 7.1.0 Fabric OS MIB Reference - Page 22

1 Understanding SNMP basics TABLE 2 Security level options Security level Protocol No security [0] (noAuthnoPriv) Authentication only [1] (authNoPriv) SNMPv1 SNMPv3 SNMPv1 SNMPv3 Authentication and Privacy [2] (authPriv) No Access [3] SNMPv1 SNMPv3 SNMPv1 SNMPv3 Query behavior Allowed. Allowed. Allowed. All SNMPv3 users allowed except noAuthNoPriv users. Not allowed. Only SNMPv3 users with authPriv privilege are allowed. Not allowed. Traps Sent. Sent. Sent. Sent for all SNMPv3 users except noAuthNoPriv users. Not Sent. Sent only for authPriv users. Not Sent. Understanding SNMP basics Every Brocade switch carries an agent and management information base (MIB), as shown in Figure 1. The agent accesses information about a device and makes it available to an SNMP network management station. Management Station SNMP Agent MIB FIGURE 1 SNMP structure When active, the management station can get information or set information when it queries an agent. SNMP commands, such as get, set, getnext, and getresponse, are sent from the management station, and the agent replies once the value is obtained or modified (Figure 2). Agents use variables to report such data as the number of bytes and packets in and out of the device, or the number of broadcast messages sent and received. These variables are also known as managed objects. All managed objects are contained in the MIB. get, getnext, set Management Station reply Agent FIGURE 2 SNMP query The management station can also receive traps, unsolicited messages from the switch agent if an unusual event occurs (Figure 3). For more information, refer to "Understanding SNMP traps" on page 4. Management Station TRAP Agent FIGURE 3 SNMP trap 2 Fabric OS MIB Reference 53-1002750-01