Speedflex between APs below 500 Mbit/s on a gigabit switch

Question

I have a customer who measures between 400 and 500 Mbit/s between his APs which are on a multi-gigabit switch. I have seen similar values in a completely different setup in our office. The Wifi speeds are between 600 and 1300 Mbit/s depending on the client and they are fine so far.

Does anyone have an idea why the speedflex between the APs is so slow? I would expect between 800 and 950 Mbit/s.

Orlando_Elias · Answer

Bearing this in mind, we understand the result of the test is given by the quality of the wired link.
My suggestions is to asnwer questions like:
What is the maximum throughout on the wired link?
Is this maximum achieved? If not, may there be errors on the links or a damanged cable? Is there any configuration in the switches restricting the data rate? Looking at the statistics of the ethernet port on the switch can help us learn about queued/dropped packets, QoS settings and other configurations that could be preventing from getting the maximum expected datarate in the port.
Anyways, all this point to the wired network and it's not related to the AP.
Do you still suspect the APs have got a problem? Make some iperf tests with 2 PCS connected in the same ports instead of the APs, and let me know the results of that test.

beni_mahler · Answer

I don't understand what you mean 'check if the evidence in the switches is congruent with the results seen on the APs'

- shall I check the LAN Port speed negotiated on the switch?

- shall I mirror the switch port of an AP to another port and capture packets and then evaulate the throughput with wireshark

?

Orlando_Elias · Answer

Thanks for clarifying.
I would not think this behavior can be explained by the APs, as this measures the performance through the wired network. I would first check if the evidence in the switches is congruent with the results seen on the APs.