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Forum Discussion
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...
The issue is not with Spectrum. I'm on Spectrum and have been using LAGG with my MB8600 with no issues. I can hit 1.22Gbps with my pfsense build. I have also tried a SB8200 without this issue. The Netgear CM1200 LACP is broken and must be out of ieee standard because if you take one of the members down the interface will no longer pass traffic. That is one of the most basic fuctions of 802.3ad "redundancy of link if a members connection is lost"
I dont think its hash related because I tested that as well using my Cisco 3850 switch. Same results with the CM1200 but I would interrested in hearing from someone with the a multigig Netgear router with the CM1200 but I wouldn't be surprised if the results are the same.
If you want multigig with Spectrum or any other provider look at the MB8600 or SB8200 and I guess maybe the CM1100 but I have not tested that model.
I can confirm that your ISP is not the issue. After several days of bouncing around with NETGEAR support (I kept getting bounced between the switch and cable modem teams since both devices are NETGEAR) and hitting up NETGEAR on Twitter, it was clear that they don't consider this a high priority issue. Even IF they do eventually fix this problem, it may take months to roll out a firmware update since your ISP has to push that to your cable modem. Long story short, if you're going to do LACP don't even bother with the CM1200. The fact that a NETGEAR employee hasn't even replied to this thread in a long time confirms to me that they just don't care. I've had great luck with the Motorola MB8600 and I've heard good things about the SB8200 as well. I'm getting around 1.2Gbps with my MB8600 and it's been up so far for almost 10 days. See attached screenshot for evidence.
The thing that gets me is that I assume the CM1200 is just running Linux; the Linux bonding driver has supported 802.3ad link aggregation / LACP for a very long time and is very, very mature. I'm not sure what NETGEAR has done with this firmware to introduce this issue.
- Kenny