EX7000 Access Point Mode To Nighthawk X6 working at 100 mbps

Hello Everyone, I have a Nighthawk X6 R8000 router connected over Cat5e cable to a EX700|AC1900 extender. The cable from the router terminates on a Cat5e compatible patch panel and I am using another Cat5e cable to connect the extender to the patch panel. The length of the cable from the router to the patch panel and to the extender is well under 100 meters distance. The extender is configured to work as an access point. Everything looks to be working good on the wifi side. 

However, the router's ethernet port LED glows amber indicating a 10 or a 100 mbps connection to the extender. My internet bandwidth is configured at 300 mbps and if I run a speed test from a wireless device connected to the R8000, I receive 279 mpbs down and 222 mbps up speeds. If I run the same speed test after connecting the same device to the extender, I receive 92 mbps down and 89 mbps up speeds. I am guessing its because the router and extender are negotiating the ethernet connection at 100 mpbs and not 1000 mpbs. 

Any ideas if I can force the ethernet connection between the router and extender to negotiate at 1000 mbps instead of 100? 

Thanks in advance for your help on this matter.