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Forum Discussion
emuman100
Mar 01, 2026Aspirant
CM3000 on Xfinity with 1200Mbit, onlt getting around 940Mbit with link aggregation
I just purchased a CM3000 for use with my Xfinity 1200mbit plan. It's currently running firmware 6.01.04. It was set up in link aggregation mode and connected to my router via ethernet ports 1 and 2....
emuman100
Mar 02, 2026Aspirant
No, I use link aggregation enabled on the CM3000 with LACP active mode on the router. Connection to the Mac is though LAG using the Mac ethernet port and a USB ethernet adapter plugged into a Cisco switch in active LACP mode to another switch, also the same, with a active LACP configuration to the router. So, this should work.
FURRYe38
Mar 03, 2026Guru - Experienced User
As a test, Do you get 1200Mbps directly connected behind the CM modem with out the router being connected and LAG disabled on the CM modem?
If you have a 2.5Gb or higher capable ethernet PC or Ethernet adapters, you should see what your pay for from your ISP from the CM modem with out the switches in line.
This would be first thing to check and test.
emuman100 wrote:No, I use link aggregation enabled on the CM3000 with LACP active mode on the router. Connection to the Mac is though LAG using the Mac ethernet port and a USB ethernet adapter plugged into a Cisco switch in active LACP mode to another switch, also the same, with a active LACP configuration to the router. So, this should work.