Configure duplex mode for S series switch

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S series switches (except S1700 switches) support the following duplex modes:
Half-duplex mode: An interface in this mode only receives or sends data at a time within a specified transmission distance.
Full-duplex mode: An interface in this mode receives and sends data at the same time. The maximum throughput in full-duplex mode is double that in half-duplex mode, and the transmission distance is not limited.
You can set the duplex mode for an Ethernet electrical interface working in either auto-negotiation or non-auto-negotiation mode.
In auto-negotiation mode, interfaces at both ends of a link negotiate the duplex mode. If the negotiated duplex mode is not the required one, you can manually set the duplex mode.
If the service traffic volume of enterprise users is high, interfaces at both ends of a link must work in full-duplex mode. Otherwise, packet loss occurs. You can run the auto duplex full command to set the duplex mode to full-duplex. After the auto-negotiation succeeds, the interfaces work in full-duplex mode.
If the service traffic volume of enterprise users is low, interfaces at both ends of a link can meet data transmission requirements when they work in half-duplex mode. You can run the auto duplex half command to set the duplex mode to half-duplex. After the auto-negotiation succeeds, the interfaces work in half-duplex mode.
If the remote device does not support auto-negotiation, you can manually set the duplex mode for the local interface in non-auto-negotiation mode to ensure that the local interface works in the same duplex mode as the remote interface.

The configuration is as follows:
1. Configure the duplex mode for an interface in auto-negotiation mode.
# Set the duplex mode for GE1/0/1 to full-duplex in auto-negotiation mode.
system-view
[HUAWEI] interface gigabitethernet 1/0/1
[HUAWEI-GigabitEthernet1/0/1] negotiation auto
[HUAWEI-GigabitEthernet1/0/1] auto duplex full
2. Configure the duplex mode for an interface in non-auto-negotiation mode.
# Set the duplex mode for GE1/0/1 to half-duplex in non-auto-negotiation mode.
system-view
[HUAWEI] interface gigabitethernet 1/0/1
[HUAWEI-GigabitEthernet1/0/1] undo negotiation auto
[HUAWEI-GigabitEthernet1/0/1] duplex half
Note:
The duplex mode cannot be configured for physical service interfaces on the X1E series cards of S series modular switches working in either auto-negotiation or non-auto-negotiation mode.
The duplex mode cannot be configured for physical service interfaces on S series fixed switches including the S5710HI, S5720HI, S5720EI, and S6720EI.

Other related questions:
Changing the duplex mode on the USG6000
Choose Network > Interface on the web UI and configure the duplex mode in auto-negotiation of the advanced option.

How do I configure link aggregation in LACP mode on S series switches
Configure link aggregation in LACP mode on S series switches (except the S1700) as follows: # Create Eth-Trunk 1 on a switch and configure Eth-Trunk 1 to work in LACP mode. [HUAWEI] interface eth-trunk 1 [HUAWEI-Eth-Trunk1] mode lacp [HUAWEI-Eth-Trunk1] quit

Can Ethernet interfaces be configured to work in half duplex mode
The following interfaces can work in half-duplex mode at the rate of 10 Mbit/s or 100 Mbit/s: FE electrical interfaces, GE electrical interfaces, and GE optical interfaces with GE copper modules installed

How to configure the Eth-Trunk hash mode on S series switches
You can run the load-balance command to configure the Eth-Trunk hash mode on S series switches (except the S1700).

How to check the interface duplex mode of an AR router
Duplex modes: - Half-duplex: An interface can either receive or send data at one time. The maximum transmission distance is also limited. - Full duplex: An interface can receive and send data simultaneously. The maximum throughput can be twice of the interface rate. In addition, the transmission distance is not limited. You can run the display interface ethernet brief command to check the brief information about the Ethernet interface of a router, including the physical state, auto-negotiation method, duplex mode, rate, and average bandwidth utilization rate in the receiving and sending directions in the recent period of the interface. In the displayed information, the Duplex column indicates the duplex mode of the interface, which can be one of the following modes: ? full: Indicates that the interface works in full-duplex mode. ? half: Indicates that the interface works in half-duplex mode. ? In auto-negotiation mode, you can run the auto duplex command to configure the duplex mode of an interface. ? In non-auto negotiation mode, you can run the duplex command to configure the duplex mode of an interface.

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