Cisco Catalyst 3550 Series Intelligent Ethernet Switches SNMP OID

IOS old values:
CPU: (Percent)
enterprises.cisco.local.lsystem.avgBusy5.0 .1.3.6.1.4.1.9.2.1.58.0 ผู้เขียนแนะนำใช้ตัวนี้ กับอุปกรณ์รุ่นเก่าๆ
(see nearby values for other timescales)
This might still work for you.

Memory: (Bytes)
enterprises.cisco.local.lsystem.freeMem.0 .1.3.6.1.4.1.9.2.1.58.0 ผู้เขียนแนะนำใช้ตัวนี้ กับอุปกรณ์รุ่นเก่าๆ
obsolete as of IOS 11.1

Newer:
CPU: (Percent)
cpmCPUTotal5sec .1.3.6.1.4.1.9.9.109.1.1.1.1.3.9
(see nearby values for other timescales)
I'm not sure if this will work for lower-end models.

Memory: (Bytes)
ciscoMemoryPoolUsed 1.3.6.1.4.1.9.9.48.1.1.1.5.1
ciscoMemoryPoolFree 1.3.6.1.4.1.9.9.48.1.1.1.6.1
CISCO-MEMORY-POOL-MIB ... you have to add the used
and free to find the total pool size, and add all the
pool sizes to find the total device memory size.
--

Additional
this device 64 MB of memory size

Reference

• http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps646/product_data_sheet09186a00800913d7.html
• http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094a94.shtml
• http://www.velocityreviews.com/forums/t40323-monitor-cpu-and-memory-using-snmp.html