When connecting a wAP AC with Mikrotik Gigabit PoE injector (fed with 24V) to a HP 1820-8G switch, it goes in to constant linkflap (sometimes settles on 10M/FD with massive packet loss). It was no issues with a older Netgear GS105 Gigabit switch or a Mikrotik GS260G. Using 5 meters of CAT6 cable.
What can be the cause? HP switch has way worse sensitivity? Interference in some way?
I will borrow a proper 802.1at injector tonight and see if it makes a difference.
So if you plug it to any other switch with the same factory provided poe injector, it does link fine at Gigabit?
Looks like either cable/injector problem, damaged port on HP (does it happen on all HP ports?) or some sort of issue between the HP switch and mikrotik.
What’s the wAP ac RouterOS and firmware version?
Make sure ethernet port on the wAP set to auto-everything.
Yes, no problems at all with a Netgear GS105E and a RB260GS. Using a 5M UTP Cat6.
Sorry, forgot to mention that I’ve tested a couple of the other ports, and the issue remains. The ports works fine with other devices and the switches mentioned above.
RouterOS 6.38.1 / FW 3.33. Ethernet1 is set to AutoNeg, Flow control=auto, Loop protect=off
I will try tonight with a proper 802.3at injector, to see if that makes any difference.
UPDATE: Yes, a proper 802.3af injector did the trick. Guess that HP doesn’t handle those passive injectors.