I want to disable the auto-negotiation
feature of NIC, I run the following command
$sudo ethtool -s ens1f0 speed 10000 duplex full autoneg off
Then I check if it takes effect via ethtool ens1f0
:
Settings for ens1f0:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 10000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
The autoneg
is still on, why it does not work?
Update 2020/8/22
My NIC is 82599ES 10-Gigabit SFI/SFP+ Network Connection 10fb
, and I found that 10GBASE-T link's auto-neg
feature can be off in some cases.
autoneg
states. I'm really confused about this.Settings for ens1f0:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 1000baseT/Full
10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 10000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
Settings for ens1f1:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: No
Supported FEC modes: Not reported
Advertised link modes: 10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: No
Advertised FEC modes: Not reported
Speed: 10000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
autoneg
is offSettings for ens1f1:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: No
Supported FEC modes: Not reported
Advertised link modes: 10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: No
Advertised FEC modes: Not reported
Speed: Unknown!
Duplex: Unknown! (255)
Port: Other
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: no
It is not possible to disable autonegotiation on a 10GBASE-T link. The 802.3 standard indicates that autonegotiation is mandatory for such links. Some of the reasons for that include:
55.6.1 Support for Auto-Negotiation
All 10GBASE-T PHYs shall provide support for Auto-Negotiation (Clause 28) and shall be capable of operating as MASTER or SLAVE. All 10GBASE-T PHYs shall provide support for Extended Next Pages as defined in 28.2.3.4.2 and shall support and use optimized FLP Burst to FLP burst timing as defined in 28.2.1.1.1, and nlp_link_test_min_timer and link_fail_inhibit_timer as defined in 28.3.2.
Auto-Negotiation is performed as part of the initial set-up of the link, and allows the PHYs at each end to advertise their capabilities (speed, PHY type, half or full duplex) and to automatically select the operating mode for communication on the link. Auto-Negotiation signaling is used for the following primary purposes for 10GBASE-T:
- To negotiate that the PHY is capable of supporting 10GBASE-T transmission.
- To determine the MASTER-SLAVE relationship between the PHYs at each end of the link.
- To determine whether the local PHY performs PMA training pattern reset.
- To determine whether the local PHY supports the EEE capability.
- To determine whether the local PHY supports the fast retrain capability.
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