Issue
I am unable to set a 10G or 40G port to 10/100M speed. I am unable to establish a link between a 10G or 40G port and a 10/100M Ethernet segment.
Environment
Cumulus Linux, all versions
Solution
Use an intervening 1G switch to connect to the slower Ethernet segment. The following configuration, for example, can be used to set a 10G port to 1G:
auto swp1
iface swp1
link-speed 1000
link-duplex full
link-autoneg off
For more information on configuring port speeds, see the Cumulus Linux User Guide:
Root Cause
Speed reduction from 10G or 40G to 10/100M is unsupported at the hardware layer.
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