OID <> MIB

[adrianmarsh]

Something I'm still missing about SNMP. I understand polling applications like Cacti are more interested in using OIDs, and that Agents use MIBs to define the data they hold.

But how do I use MIBs to figure out the OIDs I need for Cacti?

For example, I want to get a PSAX working. I don't know the OID of the ATM interfaces I'm looking for, but I've found some MIBs on the net that might help, but I can't see what to do with them or how to use them.

[BSOD2600]

If you know the MIB name of something, then you should be able to use something like GetIF or snmpget to translate it to an OID. Alternatively, you manually look up the OID in the MIB file, but thats a pain in the butt.

[adrianmarsh]

Not wanting to be a pain-in-the-youknowwhat - but could you give an example for the getif/snmpget? I've tried using some of the text-names but tend just to get errors out of the tools.

[BSOD2600]

Playing around with snmpwalk....

Code: Select all

C:\netsnmp\bin>snmpwalk -v 1 -c public 127.0.0.1 sysuptime
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (57148244) 6 days, 14:44:42.44

C:\netsnmp\bin>snmpwalk -v 1 -c public -O f 127.0.0.1 sysuptime
.iso.org.dod.internet.mgmt.mib-2.system.sysUpTime.sysUpTimeInstance = Timeticks: (57159109) 6 days, 14:46:31.09

C:\netsnmp\bin>snmpwalk -v 1 -c public -O n 127.0.0.1 sysuptime
.1.3.6.1.2.1.1.3.0 = Timeticks: (57159860) 6 days, 14:46:38.60

[adrianmarsh]

"snmpwalk" can find "sysuptime" because its defined in the DISMAN-EVENT-MIB right? If it wasn't then it wouldn't be able to find it?

So if I wanted to find out an OID for something that is in a propriatory MIB, I'd have to install that MIB into net-snmp first - ?

[BSOD2600]

Correct.

[jef]

for "quick usage", i use the -m option to specify the mib file location.

snmpwalk -On hostname -c community -m /usr/share/snmp/mibs/tsight-mib.txt enterprises.corad.tSight.watchpoints.watchpointStatsCurrent
.1.3.6.1.4.1.9723.1.1.4.1.1.1.1 = INTEGER: 1
.1.3.6.1.4.1.9723.1.1.4.1.1.1.2 = INTEGER: 2

Jef