One of the most common questions asked about SNMP is the port numbers that it uses. The answer to this varies based upon whether you’re talking about the SNMP Manager or SNMP trap. When polling, SNMP Managers uses portUDP 161. In contrast, when an Agent sends information to the Manager...
SNMP traps are notification messages sent by an SNMP agent to inform the NMS of alarms or events generated on a device. In this way, the network administrator can learn the running status of the device in a timely manner. There are two types of SNMP traps: trap and inform. The difference...
Since they are part of the TCP/IP suite, SNMP messages are bundled and transmitted by UDP. The following image is an example of such communication. SNMP Traps An SNMP trap is any event generated and sent by a device and received by a trap receiver whenever a change of state or an anoma...
TRAPS: Unlike the above commands which are initiated from the SNMP Manager, TRAPS are initiated by the Agents. It is a signal to the SNMP Manager by the Agent on the occurrence of an event. INFORM: This command is similar to the TRAP initiated by the Agent, additionally INFORM includes co...
SomeNMS toolsare more complex than others, allowing you to configure Email or SMS messages to alert you of malfunctioning devices on your network, while others simply poll devices for more basic information. Agents SNMP Agent is a piece of software that is bundled with the network device (route...
Network management station (NMS): OK, so NMS is designed to gather SNMP information by demanding the devices on the network to reveal specific data. Not only that, but devices on your network can notify the NMS about potential problems by dispatching an SNMP alert, also known as a trap. ...
The "Link Up" or "Link Down" SNMP Trap monitors the port operating status of a switch (SNMP Client). If an Ethernet cable is plugged into a port, or a cable is removed, then the SNMP Client will send a corresponding "Link Up" or "Link Down" notification
Nextto the read-only (RO) and read-write (RW) community strings, there’s also thetrap community string. This string is used to specify the community string that anSNMP agentwill use when sendingSNMP trapmessages to theSNMP client. Traps are asynchronousnotificationsfrom the agent to the clie...
For details and other settings, please seePRTG Manual: SNMP Trap Receiver Sensor The last two options are used to filter out specific messages. Configure a "state trigger" for "down" on the notification tab and PRTG will trigger an email if a message meeting any or both of th...
All messages from emergencies to informational are sent to the logging host.