G3100 Router LAN Ports Reverting to 100Mbps

[Bdipaola]

G3100 LAN Port Reverting to 100Mbps

Please help me solve this.....

I've had a G3100 for years and have been using it with a switch hanging off 1 of the LAN ports (the other 3 ports have always been un-used until today). However, today I connected up 2 Access Points using an additional 2 more ports on the G3100, and that's when the problems began.

When I first connected the 2 AP's to the LAN ports (CAT5e cables) they negotiated at 1G but then a few minutes later they reverted to 100Mbps.  when I un-plug 1 of the cables for the AP's (reducing the port usage to 2 ports used) the problem stops & the router functions normally again.

If I plug back in the AP, the problem happens again after a few minutes...the negotiations starts at 1G but then eventually reverts to 100Mbps

It appears as though the G3100 doesn't like more than 1 of it's LAN ports being used, otherwise it reverts the other LAN port connections to 100Mbps.

I've tested the cables and they're able to establish at 1G on the router provided I'm only using 1 of the LAN ports...SO STRANGE!

I've ordered a 2nd mini switch to see if the problem continues with a switch in-between the AP's and the G3100

There's tons of people on google searches with the same problem, but I cant find a solution.

Please I'm hoping someone can at least tell me if this is a known bug and if there are any solutions to use all 4 LAN ports and have them all negotiated at 1G

[dipaola]

As a follow-up I did connect a switch between the router and the AP’s and no issues, so that rules out cabling. Currently still can only use 1 LAN port on G3100 if I want to connect t at 1G. 

[dipaola]

Anyone know  a way to report this to Verizon?

[Cang_Household]

What is the PHY chip used by the APs?

If a different device is plugged to the LAN2 on G3100, what is the link speed?

[dipaola]

I’m not sure what the chip is but the Acces Point is a Ubiquiti U6 Pro. 

in LAN port 1 I have a mini switch (no problem). In LAN 2 is the AP and it negotiated at 1G then eventually drops to FE or 100M

[Cang_Household]

If a different device capable of Gigabit link speed is connected to LAN 2, does the speed drop to 100 M?

[dipaola]

Yes. No matter what you connect it’s dropped to 100M. It’s very easily reproducible 

[Cang_Household]

What other devices did you plug in?

[dipaola]

2 different access points and a laptop

[Cang_Household]

Did you try a different Ethernet cable? And may you photo me the G3100's Ethernet ports to see whether there are any corrosions?

[dipaola]

I already ruled out cabling.