hAP AC2 - RouterOS7.7 - FastTrack stops working after few hours

RouterOS General
1

Hi,
some days ago I’ve opened this thread because I was noticing problems with FastTrack on my hAP AC2 after upgrading to RouterOS 7.7.
After a reboot everything worked fine and I’ve thought that the problem was related to some config tests that possibly messed up FastTracking.

Now I had a look at my Mikrotik performance graphs and I’ve noticed that FastTrack after few hours stopped working again, with a CPU increase and speedtest down from 930Mbps to <400Mbps.

Is there any known issue with RouterOS 7.7 - FastTrack - RBD52G-5HacD2HnD-TC?
Maybe it is an issue with FastTrack and vlan-tagged traffic (at 6.x fasttrack was not working with vlan traffic, now I’ve seen that it works and I’ve enabled it also for the tagged traffic but maybe it has some issues). I’ll try to enable fasttrack for all the traffic except the tagged one (which is the 40-50Mbps traffic in the graphs) and check if it does not stop working after some hours.

Actually in my setup I have a single bridge called lan_bridge with vlan-filtering enabled and I tagged traffic is managed by lan_bridge.254 interface vlan which is placed in a vrf, so maybe it is a corner case that can give problems with FastTracking on my hardware (the thing works after a reboot, I can see it from the speedtest launched on a host on vlan 254 and from mikrotik CPU, but after a while fasttrack stops working for tagged and untagged traffic).

# feb/18/2023 10:28:09 by RouterOS 7.7
# software id = 8U9P-DH4C
#
# model = RBD52G-5HacD2HnD-TC
# serial number = xxxxx

2023-02-21 09_36_28-Mikrotik CPU_Traffic - Mikrotik - Dashboards - Grafana.png

2

I can confirm that even without fastTracking on vlan-tagged traffic, after few hours fast tracking stops working and the rule with action=fasttrack-connection matches all the traffic instead of the first bytes of a connection, thus meaning that anything is fast tracked.
I run a speed-test every 4 hours and as you can see it suddenly drops from 900 to 300Mbps after few hours. This happens after upgrading to RouterOS 7.7 from 6.x.
Screenshot 2023-02-22 alle 08.07.27.png

3

I’m in touch with MikroTik support to check for the issue, I hope they’ll find something (in my config or in RouterOS) and that it will be fixed soon.

4

Same issue on 7.8. Let’s hope support will find the root cause of the issue or at least gives me a command to reset fasttrack in order to schedule a reset every few hours until the issue is resolved, without needing a complete reboot of the router.