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spookymulder84
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WiFi speed limited if wired 100Mbps device is connected to the bridge (hAP ax2 7.18.2)

Mon Mar 24, 2025 12:49 pm

  • Simple hAP ax2 configuration 7.18.2, one bridge and all ports and WiFi's are included in it, one VLAN on bridge for management
  • The device connects to WiFi with very high data rates (over 500Mbps) but the speedtest.net gives only 93Mbps result... I first checked if there are ethernet speed problems because of the suspicious speed result, but the whole uplink chain showed 1Gbps
  • Computers connected by cable to the hAP ax2 router gives good Speedtest.net results (around 500Mbps as per provided by ISP)
  • Ethernet 1 to 3 (uplink and two computers) have 1Gbps ethernet links, except for the printer on ether4 which connects with 100Mbps
  • I disconnect the printer... and now speedtest.net over WiFi show perfect 500Mbps result

Maybe it's because I disabled (R)STP over the whole network so all bridge ports are "designated"? I'll try enabling it on all the equipment and set the priorities accordingly

Export compact (censored SSID's and other names):
# 2025-03-24 11:34:43 by RouterOS 7.18.2
# software id = R09P-ZPZJ
#
# model = C52iG-5HaxD2HaxD
/interface bridge
add name=bridge protocol-mode=none
/interface vlan
add interface=bridge name=vlan2_MGMT vlan-id=2
/interface wifi channel
add band=5ghz-ax disabled=no frequency=5180 name=5GHz width=20/40/80mhz
add band=2ghz-ax disabled=no frequency=2437 name=2GHz width=20mhz
/interface wifi security
add authentication-types=wpa2-psk disabled=no encryption=ccmp group-encryption=ccmp name=secprofile wps=disable
/interface wifi configuration
add channel=2GHz country=Montenegro disabled=no mode=ap name=wifi2 security=secprofile ssid=WiFi
add channel=5GHz country=Montenegro disabled=no mode=ap name=wifi5 security=secprofile ssid=WiFi
add disabled=no mode=ap name=wifi5_Separate security=secprofile ssid=WiFi5
/interface wifi
set [ find default-name=wifi2 ] channel.frequency=2437 configuration=wifi2 configuration.mode=ap .ssid=WiFi disabled=no
set [ find default-name=wifi1 ] channel.frequency=5180 configuration=wifi5 configuration.mode=ap .ssid=WiFi disabled=no name=wifi5
add configuration=wifi5_Separate configuration.mode=ap disabled=no mac-address=4A:A9:8A:6E:FE:A1 master-interface=wifi5 name=wifi5_Separate
/interface bridge port
add bridge=bridge interface=ether1
add bridge=bridge interface=ether2
add bridge=bridge interface=ether3
add bridge=bridge interface=ether4
add bridge=bridge interface=ether5
add bridge=bridge interface=wifi5
add bridge=bridge interface=wifi2
add bridge=bridge interface=wifi5_Separate
/ip dhcp-client
add interface=vlan2_MGMT
/system clock
set time-zone-name=Europe/Podgorica
/system note
set show-at-login=no
/tool romon
set enabled=yes
 
erlinden
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Re: WiFi speed limited if wired 100Mbps device is connected to the bridge (hAP ax2 7.18.2)

Mon Mar 24, 2025 1:15 pm

What speed do you get when you use iPerf (there is an App version)?

There is (at least for me) something odd with your config. You are adding VLAN to the bridge, but the bridge doesn't have VLAN filtering enabled. Did you configure it like this on purpose? And why do you have an additional SSID?
 
spookymulder84
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Posts: 33
Joined: Sat Nov 11, 2017 1:37 pm
Location: Croatia

Re: WiFi speed limited if wired 100Mbps device is connected to the bridge (hAP ax2 7.18.2)

Mon Mar 24, 2025 1:34 pm

I'm not near the location so I can't make an iPerf test, I can ask my friend later on.
It's how I've always done VLAN for management, is there a reason to use bridge filtering for such a simple bridge/VLAN configuration?
I've added the additional SSID while I was investigating this issue. So, the same was already happening before I've added it.

Later I'll try a full router reset and do a minimal configuration, without extra WLAN's, VLAN's... but this seemed minimal enough to cause any issues as it's right now
 
whatever
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Joined: Thu Jun 21, 2018 9:29 pm

Re: WiFi speed limited if wired 100Mbps device is connected to the bridge (hAP ax2 7.18.2)  [SOLVED]

Mon Mar 24, 2025 3:36 pm

Hardware accelerated bridge is broken/buggy on hap ax2. By disabling STP, you "accidentally"(?) enabled the faulty hardware offloading.

See footnote #6 at https://help.mikrotik.com/docs/spaces/R ... Offloading

Re-enabling STP or enabling bridge vlan filtering should disable hw offload and fix your issue.
 
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chechito
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Re: WiFi speed limited if wired 100Mbps device is connected to the bridge (hAP ax2 7.18.2)

Mon Mar 24, 2025 5:53 pm

in some circunstances if you saturate the 100m interface at the same time when you are running the test that can happen

i think is some kind of Head-of-line blocking (HOL blocking) situation
 
spookymulder84
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Posts: 33
Joined: Sat Nov 11, 2017 1:37 pm
Location: Croatia

Re: WiFi speed limited if wired 100Mbps device is connected to the bridge (hAP ax2 7.18.2)

Mon Mar 24, 2025 9:37 pm

Hardware accelerated bridge is broken/buggy on hap ax2. By disabling STP, you "accidentally"(?) enabled the faulty hardware offloading.

See footnote #6 at https://help.mikrotik.com/docs/spaces/R ... Offloading

Re-enabling STP or enabling bridge vlan filtering should disable hw offload and fix your issue.
Yeah, I've enabled RSTP, the Hardware offload got disabled and now it works properly. I probably could have just disabled the HW offload without enabling RSTP, but I guess it won't hurt (even though it's uplink is D-Link switch and not a CRS directly... though we'll probably replace it with CRS soon enough)
Thank you for your time and help!