Home Network Community > Wi-Fi Routers > LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again
< Wi-Fi Routers

LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.

LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again
LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again
2023-05-02 00:20:29
Tags: #Firmware Update #LAN Speed
Model: Archer AX72  
Hardware Version: V1
Firmware Version: 1.1.2 Build 20220520 rel.75663(4555)

Hello,

 

I experience quite often that the speed of the wired connection between my router (AX72) and my unmanaged gigabit switch (TL-SG1008D) got limited in speed. If I check the speed of connection on the router's admin page, it says that the speed of the LAN port that the switch is connected to, is 100Mbps Full Duplex but if I physically disconnect one end of the connecting UTP cable from the switch or from the router and I plug it back, I get the 1000Mbps Full Duplex (gigabit) speed again. The decreased speed can also be measured with a speed test, as I have 1000/1000 Mbps fiber service.

 

The root cause of the problem can be that I sometimes step on the cable accidentally, however, no movement happens to the connectors.

 

I use PPPoE connection towards the ISP and I could set on my TP-Link router that the speed of my WAN port (connected to the GPON modem/router, received from the ISP) must be 1000Mbps Full Duplex all the time. But I couldn't find a similar setting on the router's admin page that could be used to do the same speed forcing, so the speed of my downstream LAN port towards the switch could be forced to be 1000Mbps. Thus, the port speed frequently stucks at 100Mbps Full Duplex. And, as I mentioned, my switch is unmanaged, so I cannot set the speed of the connection from the switch side manually, as I can on my easy smart switch.

 

Could I expect a firmware update that includes this setting? Or is it already implemented but I couldn't manage to find it?

 

 

Thank you in advance!

  0      
 
  0      
 
#1
Options
3 Reply
Re:LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again
2023-05-05 11:16:24

@Simion 

 

You are not missing anything. It's not supported to modify or change the LAN Negotiation speed between the router and the client devices on the router web GUI. It is negotiated automatically.

 

Can I know how far is the SG1008D from the AX72? In other words, how long is the Ethernet cable between them? Try a shorter cable with good quality if possible.

 

You may also connect a computer that has a gigabit Ethernet adapter to the AX72's LAN port to test and monitor if it can negotiate at 1000Mbps properly.

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN Archer GE550 - BE9300 Tri-Band Wi-Fi 7 Gaming Router EasyMesh Is Available When Wi-Fi Routers Work in AP Mode as A Controller. Archer AX55V2 Supports WireGuard VPN, EasyMesh Ethernet Backhaul, IoT Network, Speed Limit,and More If you found a post or response helpful, please click Helpful (arrow pointing upward icon). If you are the author of a topic, remember to mark a helpful reply as the "Recommended Solution" (star icon) so that others can benefit from it.
  1  
  1  
#2
Options
Re:LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again
2023-05-16 23:41:08

  @Kevin_Z 

 

Thanks for your reply! My Ethernet cable is about 15 meter long and cat.6, so it shouldn't cause the problem, I think. I didn't experience the issue in the last few weeks, but each time when I physically unplug and replug the cable the speed is negotiated properly, so as 1000 Mbps. I use sometimes one or two 100Mbps Ethernet devices (Raspberry Pis) connected to the SG1008D as well. They may request this speed at power-on if my gigabit Ethernet laptop is not running at that moment.

  0  
  0  
#3
Options
Re:LAN speed keeps dropping down to 100Mbps from 1000Mbps and requires re-plugging to be 1000Mbps again
2023-05-17 02:14:12

@Simion 

 

15m with cat 6 cable should be not a problem I assume.

 

Are both the AX72 and the SG1008D purchased recently? Have you ever had a chance to test if the negotiation speed is good at 1000Mbps if you connect a computer with a gigabit Ethernet adapter to the AX72 directly bypassing the SG1008D? I would suggest trying different LAN ports on the AX72 as well as on the SG1008D.

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN Archer GE550 - BE9300 Tri-Band Wi-Fi 7 Gaming Router EasyMesh Is Available When Wi-Fi Routers Work in AP Mode as A Controller. Archer AX55V2 Supports WireGuard VPN, EasyMesh Ethernet Backhaul, IoT Network, Speed Limit,and More If you found a post or response helpful, please click Helpful (arrow pointing upward icon). If you are the author of a topic, remember to mark a helpful reply as the "Recommended Solution" (star icon) so that others can benefit from it.
  0  
  0  
#4
Options

Information

Helpful: 0

Views: 1364

Replies: 3

Tags

Firmware Update
LAN Speed
Related Articles
Speed keeps dropping
404 0
TL-SG105 keeps dropping speed from 200 to 100 Mbps
1162 0
Speed limit on 100mbps LAN to WAN
1655 0
Archer c6 keeps disconnect and dropping speed
524 0
MR500 LAN speed drops to 100 Mbps
322 0
 TL SG108 Speed Dropping from 1GBPS to 100MBPS
1086 3
About Us
Press
Copyright © TP-Link Systems Inc. All rights reserved.