Configure duplex mode for S series switch

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.

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