ASUS ZenWiFi BT10 - Why did LAN Port Drop from 1G to 100 Mbps?

[MD_Network]

I just installed a new ASUS ZenWiFi BT10, updated to latest firmware, and connected BT10 to 1GB Fiber using 20-ft Cat 8 flat cables.

I was experiencing wired 941 up/down internet speeds on 10G LAN2 and 3 ports.

Then all of a sudden, I am now showing a yellow 100 Mbps notice on both 10G LAN2 and 3 ports.

I have tried the following with no change

1. Swapped cables (including short Cat7)
2. Factory reset
3. Confirmed latest FW

I am stumped how I lost 1GB wired speeds on LAN2 and 3 ports and stuck with 100 Mbps. Anyone have suggestions what else to try?

 

[degrub]

Maybe the issue is the port on the device you are connecting from rather than the ASUS.

 

[MD_Network]

Maybe the issue is the port on the device you are connecting from rather than the ASUS.

Do not think so. Brand new MacBook Pro M4 connected to a new hub with 1GB ethernet port. Been working fine until suddenly stopped the 1GB speeds.

 

[bbunge]

connected to a new hub with 1GB ethernet port

Is it an Ethernet hub or Ethernet switch (there is a difference)? If a switch, managed or unmanaged?

I would suspect a flat CAT 8 cable. I know they are supposed to be tested and rated but.. I would put my money on a good UTP pre made Ethernet cable CAT 5e or maybe up to CAT 7. Flat cables over 9 feet...NO! And if you are connecting to 1 GB ports CAT 5e is all you need.

 

[MD_Network]

It is a T

Is it an Ethernet hub or Ethernet switch (there is a difference)? If a switch, managed or unmanaged?

I would suspect a flat CAT 8 cable. I know they are supposed to be tested and rated but.. I would put my money on a good UTP pre made Ethernet cable CAT 5e or maybe up to CAT 7. Flat cables over 9 feet...NO! And if you are connecting to 1 GB ports CAT 5e is all you need.

It is a Thunderbolt Dock hub with a 2.5GB port, that sends ethernet out via Thunderbolt 4 usb-c to MacBook Pro M4.

Well, I did nothing and I have LAN 3 port active again at 1GB connection speed.