May 14

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 or LAN.

Managed D-Link DES-1228 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 default SNMP setting is disabled. Click enable, then Apply, to set Community Settings.

D-Link DES-1228 WEB Smart Switch SNMP Settings

Community Setting: In support of SNMP version 1, the Web-Smart Switch accomplishes user authentication by using Community Settings that function as passwords. The remote user SNMP application and the Switch SNMP must use the same community string. SNMP packets from a station that are not authenticated are ignored (dropped).

The default community strings for the Switch used for SNMP v.1 management access are:

Public: The community with read-only privilege allows authorized management stations to retrieve MIB objects.

Private: The community with read/write privilege allows authorized management stations to retrieve and modify MIB objects.

Trap Setting: Traps are messages that alert network personnel of events that occur on the Switch. Such events can be as serious as a reboot (someone accidentally turned the Switch OFF), or less serious events such as a port status change. The Switch can generate traps and send them to the trap recipient (i.e. network administrator).

Setting up a Trap: Select Enable, enter a Trap Name, add the IP of the device to be monitored, and choosethe event(s) to trap. The available trap Events to choose from including:

·System Device Bootup
·Fiber Link Up / Link Down
·Fiber Abnormal Receive Error
·Fiber Abnormal Transmit Error
·Twisted Pair Link Up / Link Down
·Twisted Pair Abnormal Receive Error
·Twisted Pair Abnormal Transmit Error
·Power On/ Power Off & Power Threshold Above/Below (Only for DES-1228P)
·PoE Power Fail (Only for DES-1228P)
·Power Over Current (Only for DES-1228P)
·Power Short Circuit (Only for DES-1228P)

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Apr 17

D-Link IP Address Assignment(D-Link DES-3800 Series)

Each Switch must be assigned its own IP Address, which is used for communication with an SNMP network manager or other
TCP/IP application (for example BOOTP, TFTP). The Switch’s default IP address is You can change the default
Switch IP address to meet the specification of your networking address scheme.


The Switch is also assigned a unique MAC address by the factory. This MAC address cannot be changed, and can be found by entering the command “show switch” into the command line interface, as shown below.


The Switch’s MAC address can also be found from the Web management program on the Switch Information (Basic Settings)
window on the Configuration menu.

The IP address for the Switch must be set before it can be managed with the Web-based manager. The Switch IP address can be automatically set using BOOTP or DHCP protocols, in which case the actual address assigned to the Switch must be known.

The IP address may be set using the Command Line Interface (CLI) over the console serial port as follows:
Starting at the command line prompt, enter the commands.

config ipif System ipaddress

Where the x’s represent the IP address to be assigned to the IP interface named System and the y’s represent the corresponding subnet mask.

Alternatively, users can enter config ipif System ipaddress Where the x’s represent the IP address to be
assigned to the IP interface named System and the z represents the corresponding number of subnets in CIDR notation.
The IP interface named System on the Switch can be assigned an IP address and subnet mask, and then be used to connect a management station to the Switch’s Telnet or Web-based management agent.


In the above example, the Switch was assigned an IP address of with a subnet mask of The user may also use the CIDR form to set the address (

The system message Success indicates that the command was executed successfully. The Switch can now be configured and managed via Telnet and the CLI or via the Web-based management.

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