Unable to negotiate 1Gbps - MikroTik CRS109-8G-1S-2HnD and Hitron CODA-4582U

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max88

New Member
Jun 10, 2016
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Was going to post this on MikroTik forum, but it's not taking new user registration at the moment. Posting here, hoping someone can shed some light on this, or those with MikroTik forum account can link to this for me. Thank you.

I bought a new MikroTik CRS109-8G-1S-2HnD a few days ago. Links speed cannot reach 1Gbps between itself and the cable modem Hitron CODA-4582U provided by my ISP. Have tried multiple cat 5/5e/6 cables, with different ports on the Hitron.

CRS109 came with RouterOS 6.45.1. Tested with 6.45.2, 6.44.5, and 6.43.16. Currently at 6.44.5.

My existing setup is a MikroTik RB750G r3, with a very old Linksys E3200 for wifi and additional ports. RB750Gr3 is connected to cable modem at negotiated 1Gbps. Speedtest.net is over 750Mbps when connected to RB750Gr3, while at 300~400Mbps when connected to Linksys E3200. ISP service SLA is 300Mbps, but I am not going to complain.

When auto-negotiation=yes, the new CRS109 cannot maintain a stable connection. Speedtest.net is less than 1Mbps (yes, a few hundred Kbps) download, and single digit Mbps upload. After some minutes, link speed drops to 100Mbps. When set to auto-negotiatiion=no and speed=1Gbps, status becomes no-link.

Code:
/interface ethernet set ether1 auto-negotiation=no speed=1Gbps
/interface ethernet monitor ether1
It's only when turning off auto-negotiation and setting link speed at 100Mbps or 10Mbps, there is a stable connection. Speedtest.net: 100Mbps -> 50~60Mbps, 10Mbps -> 5~7Mbps.
Code:
/interface ethernet set ether1 auto-negotiation=no speed=100Mbps
A work around is to put a dumb switch between CRS109 and Hitron. Speedtest.net clocks 200~400Mbps depending on test server, and I am fine with such speed. But using a dumb switch is just dumb (no pun intended), the whole purpose is to replace RB750Gr3 + Linksys E3200.

Question: does anyone think this is a defect, or mis-configuration?

Someone posted similar issue with CRS326-24G-2S+
Significant Speed Issues with MikroTik - MikroTik
 
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