AP health very high latency rate.

[MerakiNew]

There are no issues with internal network, but the wireless latency is very high (average wireless latency of 300–500ms).

When connected via AP and sending pings from a laptop to the gateway, the response time occasionally spikes significantly (upto 100ms). When connected via a wired connection and sending pings to the gateway, there are no issues at all (all 1ms).

When the response time spikes, the wireless connection to the POS server DB becomes unstable, causing inconvenience for users connected wireless. Since the problem only occurs on wireless and not on wired connections, it seems that interference is the most significant factor.

I have already adjusted TX power and enabled band steering, but the same symptoms persist.

Are there any additional measures I can take?

[RWelch]

In the upper RH corner of your dashboard do you see the bell (ALERT) icon?  Does it have a red dot?

Root Cause Analysis (RCA) - Alert Based Workflows 

Often the alerts can give you insight to the issue and steps to troubleshoot.

[MerakiNew]

Dear Rwelch

Thank you for your reply.

But unfortunately there are any alert icons in this network.

[RWelch]

High latency is often an indication of channel congestion/interference, overloaded AP, or poor wireless signal.

You can start with looking at these high latency devices' signal strength and looking at which AP they are connected with to see if there is high channel congestion or interference.

[MerakiNew]

Dear RWelch

Thank you for your reply.

There are very few clients in each APs (up to five or six).

And I checked interference but I think there are not much interference in problemetic APs,,

[RWelch]

What MR firmware are you running?

Is the latency high for all wireless devices?  Or some wireless devices?  Does it apply to a particular area/zone or section of your network?

[MerakiNew]

Dear RWelch,

Thank you for your reply.

firmware version is MR 31.1.6 (up to date)

High latency with some wireless devices.

The three most problematic APs are two close together and one far away.

Could it be an AP hardware issue...?

[RWelch]

Based on the dashboard screenshots shared, I don't suspect it is hardware related but very well could be.  It could possibly be a wired cable issue (you could consider testing another cable to the poor performing APs which would also reboot the AP - for further monitoring).

I would probably take a closer at the RF settings (min bit rate, channel width, band steering).

What RF profile are you using?  All the same RF Profile for all APs or does one zone have a designated RF Profile, or does each AP have it's own RF profile?

Could it be a client device issue?  Always a possibility but you'd likely be able to notice based on the devices being impacted if that is/was/were the case.

[MerakiNew]

Dear RWelch

Thank you for your replying.

This network is very small. It's a single store, and all eight APs use the same RF profile. To test for interference, I adjusted the TX values. Band steering and DFS are also enabled. The bandwidth is fixed at 20 MHz to reduce interference.

I thought it might be a LAN card issue, so I ran it on several devices including my PC and the customer's PC, and the results were the same.

The strange thing is, when I connect wirelessly to AP1 and do a ping test, there are times when the ping spikes clearly (up to 100ms), and my client runs the test at the same time and gets the same results. However, AP1's latency appears normal on the dashboard.

[RWelch]

Wishing you the best!

[MerakiNew]

Thank you!