Mappy
Itinéraires

Command Failed Port Not Compatible Duplex Mode [2021] Jun 2026

At 10 Gbps and above, the Ethernet standard operation. Half-duplex was dropped after Gigabit Ethernet (802.3ab). Therefore:

Last updated: 2025 – Compatible with Cisco IOS 15.x/17.x, NX-OS 9.x/10.x, Arista EOS 4.x, JunOS 21+. command failed port not compatible duplex mode

If the speed is set to auto , the duplex must also be auto . You generally cannot have speed auto and duplex full configured simultaneously on many platforms. The switch needs both to be negotiated or both to be hardcoded to ensure a stable link. At 10 Gbps and above, the Ethernet standard operation

Configuring Port Channels [Cisco Nexus 9000 Series Switches] At 10 Gbps and above

At 10 Gbps and above, the Ethernet standard operation. Half-duplex was dropped after Gigabit Ethernet (802.3ab). Therefore:

Last updated: 2025 – Compatible with Cisco IOS 15.x/17.x, NX-OS 9.x/10.x, Arista EOS 4.x, JunOS 21+.

If the speed is set to auto , the duplex must also be auto . You generally cannot have speed auto and duplex full configured simultaneously on many platforms. The switch needs both to be negotiated or both to be hardcoded to ensure a stable link.

Configuring Port Channels [Cisco Nexus 9000 Series Switches]