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CM1200 slows down after 24-48 hours of uptime when using link aggregation
If I hook up my CM1200 to my router (an Asus RT-AX88U) in Link Aggregation mode, it seems to be consistenly slow down to only around 66-ish% of the full connection speed after somewhere between 24 an...
I have been experiencing similar problems to what others have reported in this thread so thought I would provide some additional perspective.
My configuration is a CM1200 (firmware 1.02.02) connected to a Netgear XS716T switch (10 gigabit switch). The CM1200 connects to Xfinity/Comcast Gigabit cable service. Cable connection data (SNR and Power) look very similar when performance is degraded to what they are when performance is good.
Before performance degradation is encountered I can repeatedly measure download performance between 1100 to 1200 megabits and upload performance between 39 to 42 megabits. Performance is being measured via speedtest.xfinity.com using Chrome as the browser. The CM1200 connects via LACP to the XS716T. The traffic then passes through an OPNSense firewall with 10 Gigabit LAN and WAN interfaces connected to the XS716T switch. The desktop running the test also connects to the XS716T switch with a 10 Gigabit interface. If I run the performance test via either IE or Edge the results are less than with Chrome which I have not taken the time to understand.
When speeds degrade typical results are 22 Megabits down and 16 to 22 Megabits up. The degradation occurs after a few hours. A modem factory reset, modem power cycle, or disabling and enabling the LACP/lag interface on the switch restores performance. I did notice that when I disabled and enabled the lag interface the first speed test I ran afterwards performance was only somewhat restored (139/19). When I tested again after a couple of minutes speed was 1189/41.
I have not seen the degraded ping times to the CM1200 that are mentioned in this thread. I believe I have seen the LACP problem not failing over to a single connection that is mentioned in this thread, but I have not investigated.
When I have checked the switch or the modem during degraded speeds link aggregation has appeared to be functioning normally. I have just started looking at port statistics on the switch, and there may be a correlation with "Total Transmit Errors" / "Dropped Transmit Frames" on the switch ports the CM1200 is connected to occurring when speed is degraded.