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-   -   Not able to turn off auto negotiation in gigabite interface. (https://www.linuxquestions.org/questions/linux-newbie-8/not-able-to-turn-off-auto-negotiation-in-gigabite-interface-923398/)

pinga123 01-12-2012 02:25 AM

Not able to turn off auto negotiation in gigabite interface.
 
Even after i run command not to set auto negotiation on my gigabit interface ,it does no difference to the interface.

Please suggest.

Code:

# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000003 (3)
        Link detected: yes


# ethtool -s eth0 speed 1000 autoneg off


# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000003 (3)
        Link detected: yes


kbp 01-12-2012 09:28 PM

Maybe the manufacturer isn't supporting the option to change, quote from wp:

Quote:

Autonegotiation was originally defined as an optional component in the fast Ethernet standard. It is backwards compatible with 10BASE-T. The protocol was significantly extended in the gigabit Ethernet standard, and is mandatory for 1000BASE-T gigabit Ethernet over copper


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