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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.
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.
I just verified connecting the CM3000 to my Mac and the Ookla speedtest is showing ~1300Mbit like it should. I don't have load balancing set up on the router or switches. That's my issue. Thank you so much for your help!!