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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....
The Ookla speedtest, both app and in-browser is multi-connection, so shouldn't this be multiple data flows? I've seen other's Ookla results with link aggregation and it's well over 1000Mbit, so is there something wrong or is the Ookla speedtest not truly multi-connection?
It depends on the load balancing algorithm used by LACP. Layer 3+4 might separate out the connections, layer 2 would not. I don't know what the CM3000 does, but generally devices that support layer 3+4 let you configure the load balancing. Devices that don't let you configure it are using layer 2.
Another factor (specific to speed tests) is that they aren't directly measuring throughput. They are looking at packet delivery timing.
You could try (briefly) hooking the Mac up directly to the CM3000 and testing that.
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.
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.
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.