Zenoss - Admin Guide - Open Source Application, Server, and Network Management

1. SNMP from the Command Line
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1. SNMP from the Command Line

OID represent the data points where the data for the graphs comes from. Sometimes the reason that a graph is not appearing is because the OID for the particular graph is not valid for the device. You can test this validity using the command line to see if you can return a value. To test the validity of an OID data point giving performance data:

SSH to the Zenoss instance.

Use Username: root

Password: zenoss
Run the command snmp get for one of the OIDs

In this case lets use the command:
```
$ snmpget -v1 -cpublic build .1.3.6.1.4.1.2021.4.14.0
```
If the OID is valid it will return a value.

Here are some basic SNMP Operators to gather certain information.
1. Walk a basic system MIB.
```
snmpwalk -v1 -cpublic <device name> system
```
2. Walk an interface description
```
snmpwalk -v1 -cpublic <device name> ifDescr
```
3. Get a single value.
```
snmpget -v1 -cpublic <device name> ifDescr.2
```
4. Detailed description of an OID value.
```
snmptranslate -Td RFC1213-MIB::ifDescr
```
5. Convert a name to a raw OID.
```
snmptranslate -On RFC1213-MIB::ifDescr
```
6. Convert a raw OID to a short name
```
snmptranslate -OS .1.3.6.1.2.1.2.2.1.2
```

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Chapter 16. SNMP Monitoring	Home	Chapter 17. Alerting Rules