Monitoring Cisco ASA's - Power feeds

[ChrisNoon]

When polling a Cisco ASA 5555 with the SNMP string '1.3.6.1.2.1.47.1.1.1.1.7', I receive the following information:

<output ommited>

iso.3.6.1.2.1.47.1.1.1.1.7.21 = STRING: "Power-supply 0"
iso.3.6.1.2.1.47.1.1.1.1.7.22 = STRING: "Power Supply 0 Presence Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.23 = STRING: "Power Supply 0 Input Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.24 = STRING: "Power Supply 0 Fan"
iso.3.6.1.2.1.47.1.1.1.1.7.25 = STRING: "Power Supply 0 Fan Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.26 = STRING: "Power Supply 0 Temperature Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.27 = STRING: "Power-supply 1"
iso.3.6.1.2.1.47.1.1.1.1.7.28 = STRING: "Power Supply 1 Presence Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.29 = STRING: "Power Supply 1 Input Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.30 = STRING: "Power Supply 1 Fan"
iso.3.6.1.2.1.47.1.1.1.1.7.31 = STRING: "Power Supply 1 Fan Sensor"
iso.3.6.1.2.1.47.1.1.1.1.7.32 = STRING: "Power Supply 1 Temperature Sensor"

<output ommited>

So I use another string to then monitor the status of the power supplies:

iso.3.6.1.2.1.47.1.1.1.1.4.21

The issue I have is with the smaller versions of the ASA (5525 and 5515).  These don't appear to have the Power Supply output in the relevant MIBs.  Is there another MIB I should be hitting?  How do other people monitor the power supplies of these units?

[marce1000]

 - It is often common for low end hardware models to not implement all of the MIB features due to simpler hardware design.

M.

[smartnet@sicl.co.uk]

Chris, 

I think 5515 and 5525 only come with single power supply, so there is little point monitoring its status separate from the status of the firewall itself. If only power supply fails in a firewall, the entire firewall is down anyway. That might be the reason for not implementing that monitoring in lower models.