Aruba 7030 will not work with Cisco/Ruckus switches - but works fine with Unifi or pfSense x86 box?

tl;dr - Aruba 7030 does not work with Cisco/Ruckus switches - but works fine with a Unifi switch, or a x86 box with Intel NICs.

Our router is a x86 box running pfSense - the NICs are Intel I211-AT.

Our switch is a Cisco 3650-24PD, running IOS-XE 16.09.04.

We have an Aruba 7030 wireless controller.

For some reason, when we plug it into the Cisco switch, there is no LAN activity light for the Aruba 7030, and the device is not reachable (nor can it reach any other hosts).

Likewise, when we tried with a Ruckus 7150-C12P switch - the LAN activity light also stubbornly stayed off, and "show interfaces brief" seemed to indicate the interface was down.

However, this is the weird thing - when we plug the Aruba 7030 into either a Unifi switch (US-8-150W), or directly into the pfSense router directly, the LAN lights do start blinking, and the controller is reachable.

I'm completely dumbfounded - I even tried disabling POE on the Ruckus for that port, but still no luck.

Any ideas what is going on?

(And the even weirder thing is - we have other networks with Aruba 7030 + Ruckus 7150-C12P, which seem to work fine).