Snmp Trap Variable Bindings Manual Launch Mode

The paragraph is describing the general (i.e., generic) form for a variable OID, not using in general to mean a non-committal well, its usually like this, but not always.

To identify the corresponding instance wed have to go through all of them and compare with the values in the trap.

Surprising that implementers still get that wrong I should note, though, that its not necessary for a VALUE to have instance identifiers if its not identifying an instance of anything.

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Fortunately for us, SNMP traps get that great eventClassKey set that gives us a big head start.

Zenoss will accept SNMP traps from your devices as soon as you configure those devices to send traps to your Zenoss server.

The zentrap daemon will listen to the standard SNMP trap port of 162udp and create an event for every trap that it receives.

However, without you giving Zenoss more information about the contents of those traps, the events will contain numeric OIDs and be nearly impossible for a human to decipher.

Choose Add to ZenPack from the gear menu at the bottom of the list.

Simulating SNMP Traps To more easily configure and test Zenoss trap handling, its useful to know how to simulate SNMP traps.

The alternative is breaking your real devices in various ways and hoping to be able to get the device to send all of the traps you need.

Choose Traps from the drop-down box in the middle of the right panel.

Well now see information about this trap in the bottom-right panel.

Send a Simple Trap Use the following steps to get your feet wet sending a basic trap.

Snmp Trap Variable Bindings Manual Launch Mode

If you have stopped the zentrap service, or if you have it configured to manual launch mode, you will need to start it.

Were going to be sending simulated SNMP traps from the serviced host, and will need to know what address to send traps to so theyre received by zentrap.

Send an SNMP trap.

Run the following snmptrap command on the serviced host.

Double-click the snmp trap netBotzTempTooHigh event in the event console to see its details.

Send a Full Trap Now that weve proved out a simple trap, we should add variable bindings or varbinds to the trap.

If you look at the netBotzTempTooHigh trap in the Zenoss web interfaces MIB explorer again, youll see that theres an extensive list of Objects associated with the trap definition.

A variable binding allows the device sending the SNMP trap to attach additional information to the trap.

In this example, one of the variable bindings for the netBotzTempTooHigh trap is netBotzV2TrapSensorID.

This will give us a way to know which one of the sensors has exceeded its high temperature threshold.

NETBOTZV2-MIB::netBotzV2TrapSensorID (OID) s (type) nbHawkEnc1TEMP1 (value) We can continue to add sets of these three parameters to add as many other variable bindings to the trap as we want.

Note that the only difference between this event and the simple event is the addition of the netBotzV2TrapSensorID field.

So now you see how Zenoss take the namevalue pairs that are the SNMP traps variable bindings and turn them into namevalue pairs within the resulting event.

Mapping SNMP Trap Events Now that were able to create SNMP traps anytime we want, its time to use Zenoss event mapping system to make them more useful.

The most important field on an incoming event when it comes to mapping is the eventClassKey field.