For Cisco devices, you can use the command:

show snmp-server oidlist

To see the available OIDs for your system, login to your Cisco account and search in the object navigator: http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en

Linux OIDs (these tend to work for network devices like F5 too)

Statistics

CPU

• 1 minute Load: .1.3.6.1.4.1.2021.10.1.3.1
• 5 minute Load: .1.3.6.1.4.1.2021.10.1.3.2
• 15 minute Load: .1.3.6.1.4.1.2021.10.1.3.3
• percentage of user CPU time: .1.3.6.1.4.1.2021.11.9.0
• raw user cpu time: .1.3.6.1.4.1.2021.11.50.0
• percentages of system CPU time: .1.3.6.1.4.1.2021.11.10.0
• raw system cpu time: .1.3.6.1.4.1.2021.11.52.0
• percentages of idle CPU time: .1.3.6.1.4.1.2021.11.11.0
• raw idle cpu time: .1.3.6.1.4.1.2021.11.53.0
• raw nice cpu time: .1.3.6.1.4.1.2021.11.51.0

Memory

• Total Swap Size: .1.3.6.1.4.1.2021.4.3.0
• Available Swap Space: .1.3.6.1.4.1.2021.4.4.0
• Total RAM in machine: .1.3.6.1.4.1.2021.4.5.0
• Total RAM used: .1.3.6.1.4.1.2021.4.6.0
• Total RAM Free: .1.3.6.1.4.1.2021.4.11.0
• Total RAM Shared: .1.3.6.1.4.1.2021.4.13.0
• Total RAM Buffered: .1.3.6.1.4.1.2021.4.14.0
• Total Cached Memory: .1.3.6.1.4.1.2021.4.15.0

Disk

• Path where the disk is mounted: .1.3.6.1.4.1.2021.9.1.2.1
• Path of the device for the partition: .1.3.6.1.4.1.2021.9.1.3.1
• Total size of the disk/partion (kBytes): .1.3.6.1.4.1.2021.9.1.6.1
• Available space on the disk: .1.3.6.1.4.1.2021.9.1.7.1
• Used space on the disk: .1.3.6.1.4.1.2021.9.1.8.1
• Percentage of space used on disk: .1.3.6.1.4.1.2021.9.1.9.1
• Percentage of inodes used on disk: .1.3.6.1.4.1.2021.9.1.10.1

Uptime

• System Uptime: .1.3.6.1.2.1.1.3.0