Troubleshooting guide

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Cisco Wide Area Application Services Configuration Guide
OL-26579-01
Chapter 1 Configuring SNMP Monitoring
About SNMP
• SNMP agent—A software module that resides on a managed device. An agent has local knowledge
of management information and translates that information into a form compatible with SNMP. The
SNMP agent gathers data from the Management Information Base (MIB), which is the repository
for information about device parameters and network data. The agent can also send traps, or
notification of certain events, to the management system.
• Management station—Also known as the SNMP host, the management station uses SNMP to send
the agent an SNMP Get request to obtain information from the WAAS device. The managed devices
then collect and store management information and use SNMP to make this information available
to the management station.
Before you can access this SNMP information, you must have deployed an SNMP management
application on a management station. This SNMP management station is referred to as the SNMP host
because it uses SNMP to send the device agent an SNMP Get request to obtain information from the
WAAS device.
This section contains the following topics:
• SNMP Communication Process, page 1-2
• Supported SNMP Versions, page 1-3
• SNMP Security Models and Security Levels, page 1-3
• Supported MIBs, page 1-4
• Downloading MIB Files, page 1-11
• Enabling the SNMP Agent on a WAAS Device, page 1-11
SNMP Communication Process
The SNMP management station and the SNMP agent that resides on a WAAS device use SNMP to
communicate as follows:
1. The SNMP management station (the SNMP host) uses SNMP to request information from the
WAAS device.
2. After receiving these SNMP requests, the SNMP agent on the WAAS device accesses a table that
contains information about the individual device. This table, or database, is called a Management
Information Base (MIB).
Note The SNMP agent on the WAAS device only initiates communication with the SNMP host
under unusual conditions; it will initiate communication when it has a trap it needs to send
to the host. For more information on this topic, see the “Enabling SNMP Traps” section on
page 1-13.
3. After locating the specified information in the MIB, the agent uses SNMP to send the information
to the SNMP management station.
Figure 1-1 illustrates these SNMP operations for an individual WAAS device.