D-Link DGS-1100 Series Switch User Manual
SNMP
Simple Network Management Protocol (SNMP) is an OSI Layer 7 (Application Layer) designed
specifically for managing and monitoring network devices. SNMP enables network management
stations to read and modify the settings of gateways, routers, switches, and other network devices.
Use SNMP to configure system features for proper operation, monitor performance and detect
potential problems in the Switch, switch group or network.
Managed devices that support SNMP include software (referred to as an agent), which runs locally
on the device. A defined set of variables (managed objects) is maintained by the SNMP agent and
used to manage the device. These objects are defined in a Management Information Base (MIB),
which provides a standard presentation of the information controlled by the on-board SNMP agent.
SNMP defines both the format of the MIB specifications and the protocol used to access this
information over the network.
The Switch supports the SNMP versions 1, and 2c. The two versions of SNMP vary in the level of
security provided between the management station and the network device.
In SNMP v.1 and v2c, user authentication is accomplished using ‘community string’, which function
like passwords. The remote user SNMP application and the Switch SNMP must use the same
community string. SNMP packets from any station that has not been authenticated are ignored
(dropped).
Traps
Traps are messages that alert network personnel of events that occur on the Switch. The events can
be as serious as a reboot (someone accidentally turned OFF the Switch), or less serious like a port
status change. The Switch generates traps and sends them to the trap recipient (or network
manager). Typical traps include trap messages for Authentication Failure, and Topology Change.
MIBs
The Switch in the Management Information Base (MIB) stores management and counter information.
The Switch uses the standard MIB-II Management Information Base module. Consequently, values
for MIB objects can be retrieved from any SNMP-based network management software. In addition
to the standard MIB-II, the Switch also supports its own proprietary enterprise MIB as an extended
Management Information Base. Specifying the MIB Object Identifier may also retrieve the proprietary
MIB. MIB values can be either read-only or read-write.
The Switch supports the Simple Network Management Protocol (SNMP) versions 1, and 2c. The
administrator can specify the SNMP version used to monitor and control the Switch.
SNMP settings are configured using the menus located on the SNMP folder of the Web manager.
Workstations on the network that are allowed SNMP privileged access to the Switch can be
restricted with the Management Station IP Address menu.
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