Understanding Snmp Basics - Brocade Communications Systems 8 Reference Manual

1

Understanding SNMP basics

TABLE 1
Security level
No security [0]
(noAuthnoPriv)
Authentication only [1]
(authNoPriv)
Authentication and
Privacy [2]
(authPriv)
No Access [3]

Understanding SNMP basics

Every Brocade switch carries an agent and management information base (MIB), as shown in
Figure
network management station.
FIGURE 1
When active, the management station can get information or set information when it queries an
agent. SNMP commands, such as get, set, getnext, setnext, and getresponse, are sent from the
management station, and the agent replies once the value is obtained or modified
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.
FIGURE 2
The management station can also receive traps, unsolicited messages from the switch agent if an
unusual event occurs
information.
FIGURE 3
2
Security level options
Protocol
SNMPv1
SNMPv3
SNMPv1
SNMPv3
SNMPv1
SNMPv3
SNMPv1
SNMPv3
1. The agent accesses information about a device and makes it available to an SNMP
Management Station
SNMP structure
Management Station
SNMP query
(Figure 3). Refer to
Management Station
SNMP trap
Query behavior
Allowed.
Allowed.
Allowed.
All SNMPv3 users allowed except
noAuthNoPriv users.
Not allowed.
Only SNMPv3 users with authPriv
privilege are allowed.
Not allowed.
SNMP
Agent
get, getnext, set
reply
"Understanding SNMP traps"
TRAP
Traps
Sent.
Sent.
Sent.
Sent for all SNMPv3 users
except noAuthNoPriv users.
Not Sent.
Sent only for authPriv users.
Not Sent.
MIB
(Figure
Agent
on page 4 for more
Agent
Fabric OS MIB Reference
53-1001768-01
2).