how to set speed to 2.5G with Auto-negotiation off in ls1046ardb

[940785652]

I set speed to 2.5G with Auto-negotiation off in ls1046ardb,but It is not work,  It only works with Auto-negotiation on,but It orks for 100mb/s with Auto-negotiation off.what can i do to make it working in 2.5G .this is my commond:ethtool -s fm1-mac9 autoneg off speed 2500 duplex full

[940785652]

I use the commond(ethtool -s fm1-mac9 autoneg off speed 2500 duplex full),then i show the speed of fm1-mac9 by ethtool,It is 2500mb/s,but I ping the net who only is 100mb/s,it is ok,so I think the phy is not restart,it works as the first time that it is auto-negotiation to 100MB/s.

[bpe · Accepted solution]

The behaviour you described is as expected. When you set the PHY to
a certain data rate with autoneg disabled and connect it to a network which
does not support that data rate, it the PHY transitions to the it's default
which is 100M which eventually matches the network data rate.

Have a great day,
Platon

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