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Forum Discussion
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....
After provisioning, I'm only getting around 940Mbit in Ookla speedtests. My Mac and switches are all connected via two ethernet ports in LACP active mode back to my router. I should be getting ~1300Mbit in speedtests.
A common misconception here on LACP. Each dataflow is mapped to a single NIC - which means that it is limited to 1 gpbs. You only get more throughput when you have multiple flows - for instance, downloading from multiple clients simultaneously. Also, the decision on how to map each flow is made by the sending device. So the router is deciding how to map the download flows to the switch, and the switch decides how to map the download flows to the Macs (perhaps differently).
FWIW, LACP (and static LAG) perform best when set up as a trunk between switches/routers which carry a lot of data flows. Results are often disappointing on home networks, because they generally don't have enough simultaneous flows to get good load balancing.
940 mbps is a reasonable measurement for a 1 gigabit ethernet connection.
My upload speeds are around 20-30Mbit when they should be ~40Mbit.
Are you ever seeing faster speeds? I'd expect something between 35 and 40 mbps. If not, you might want to contact Xfinity.