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1–SNMP Overview
Traps
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The Manager is the application through which the network administrator performs
network management functions. The SNMP agent is the direct interface on the
switch for any SNMP manager connecting to the switch using the SNMP protocol,
as shown in Figure 1-1. The agent will be started by the script file(s) responsible
for switch initialization when the switch powers up or when the switch is reset.
When an SNMP request arrives at the agent, the agent will compose a message
and pass it on to Switch Management to process the message and provide a
response to the agent. The agent then provides a response to the originator of the
SNMP request. The SNMP agent does not have direct access to the internal
database of the switch.
Figure 1-1. SNMP Interface Architecture
Traps
Traps are notification messages sent from the switch to a registered manager
when a change of state occurs within the switch. A change of state can be an
alarm condition or simply a configuration change.
The Fibre Alliance MIB defines a trap table configurable through SNMP. A trap
table may have up to 5 entries, and can be configured using the SNMP Manager
or Enterprise Fabric Suite graphical user interface. The same trap table
information is available to both SNMP Manager and Enterprise Fabric Suite.
A trap event is reported when the incoming error has a severity level less than or
equal to the configured severity level. The trap event types and trap severity levels
are listed in Tabl e 1-1 . Refer to Table 4-1 for information on specific traps.
Workstation with SNMP
Manager Application
Switch with Agent and
Common User Interface API
Ethernet Connection