Chelsio Communications Terminator Series Installation And User Manual page 38

Chapter I. Chelsio Unified Wire
If auto-negotiation is disabled, ensure that the same FEC is set on both sides of the link, for the
link to come up.
Setting Speed
T6 100G ports support multiple speeds viz. 100G, 50G, 40G, 25G, 10G and 1G. T6 25G ports
support 25G, 10G and 1G speeds. The supported speeds can be seen using ethtool.
ethtool v4.8 or higher required.
Note
Below is a sample output for T6 100G port:
Before setting 40G, 10G or 1G speeds, FEC should be disabled on the port
Important
using:
•
Optics
Optics do not support auto-negotiation. Use the following command to change the speed:
[root@host~]# ethtool -s <ethX> speed <speed> autoneg off
The speed, duplex and FEC (if applicable) should be manually set to the same values on the
PEER for the link to come up.
Chelsio Unified Wire for Linux
cxgbtool <ethX> fec off
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