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LX2160ARDB – DPMAC3, DPMAC4 port not able to do the auto negotiation.

Question asked by Prabhat Kumar Shukla on May 22, 2019
Latest reply on May 23, 2019 by Prabhat Kumar Shukla



I am working on one project where I have to log the data from device (like PC) to the Lx2160 ARDB board.

Data coming from PC is at 1Gps speed and I want to log the data at DPMAC3 and DPMAC4 which is by default configured at 10Gbps.

So here I want to auto negotiate the DPMAC3 and DPMAC4  port to 1Gbps speed. But it Is not happening. can anyone please help me here?


I know that we have two port (DPMAC17 and DPMAC18) for 1Gbps speed also but for my project I am using these two ports for some other purpose.


I have done below steps to verify this-


  1. Creating new DPMAC instance-
    1. By script ./ DPMAC.3
    2. By Utility ls-addni DPMAC.3
    3. ls-listni shows below output –


dprc.1/dpni.1 (interface: eth0, end point: dpmac.3)

dprc.1/dpni.0 (interface: eth1, end point: dpmac.17)


  1. assign the IP and netmask to new eth0
    1. ifconfig eth0 netmask up


  1. Print the property with ethtool command
    1. ethtool eth0 (if eth0 has been connected to new dpmac.3)


Settings for eth0:

        Supported ports: [ ]

        Supported link modes:   Not reported

        Supported pause frame use: No

        Supports auto-negotiation: No

        Supported FEC modes: Not reported

        Advertised link modes:  Not reported

        Advertised pause frame use: No

        Advertised auto-negotiation: No

        Advertised FEC modes: Not reported

        Speed: 10000Mb/s

        Duplex: Full

        Port: Twisted Pair

        PHYAD: 0

        Transceiver: internal

        Auto-negotiation: on

        MDI-X: Unknown

        Link detected: yes


This always configured as 10Gbps speed.

I have tried to change the speed and other parameter with ethool utility but it did not help.

Can you please guide what should I do here ?


Please let me know if you need any other information.


Thanks and Best Regards,