We are using many Allied Telesis switches in our network and would like to see the status of their fans and power supplies on our site. The Switches are monitored via SNMPv3 and we already have their interfaces, filesystems and memory as services.
HW/SW-Inventory is also implemented but a fan or power supply state is also missing there.
What are our options now? Do we have to write a custom check for this? Does anyone have experience with AT-Switches and checkmk?
FIrst I’d see if someone else have done this, or if this can be done natively. if not yes you have to write your own plugin
you can also add these metrics manually with the snmp nagios check if you know the OIDs for these metrics and states.
Sadly i only find very few topics about checkmk and allied telesis on the forum or anywhere else. It would make sense if this is supported natively but apparently it isn’t.
Hi @JOTT,
if there is not existing integration for the use case you have, you can always get in contact with Checkmk or a Checkmk Partner. Checkmk Partners can develop a custom integration that suits your needs. The alternative would be to write your own Checks and Plugins. The alternative is free, but you have to invest your time into it.
Extra tip:
If you have the MIB of your switches, you can see how they implemented the PSUs and Fans, and maybe you can reuse already existing Checks that are made for other vendors. That means you don’t have to reinvent the wheel, and you just have to keep it up to date with the upstream code. 
Hope this helps!
Norm