What interface attributes are affected after the interface auto-negotiation mode is changed

14

When the auto-negotiation mode of an interface is changed from auto-negotiation to non-auto-negotiation, the default interface rate and duplex mode are restored. For example, when a GE electrical interface works in auto-negotiation mode, the rate negotiated with the remote interface is 100 Mbit/s and the duplex mode is half-duplex. After the interface is configured to work in non-auto-negotiation mode, the interface rate is restored to 1000 Mbit/s and the duplex mode is full-duplex.

NOTE:
You should change the auto-negotiation mode on both the local and remote interfaces. Otherwise, the interfaces may be Down.

Other related questions:
Modify attributes of interfaces on the S1728GWR-4P switch
Modify the attributes (including the auto-negotiation mode, manual setting of port rate, full duplex mode, and traffic control) of an interface on an S1728GWR-4P switch using either of the following methods: 1. Port-based configuration: a. Choose Interface > Port > General. b. Select Configure by Port Range from the Action drop-down list box. Configure parameters of interfaces within a range in a batch. c. After completing the configuration, click Apply. The configuration takes effect immediately. To check status of each interface, choose Interface > Port > General and select Show Information from the Action drop-down list box.�?2. Port list based configuration: a. Choose Interface > Port > General. b. Select Configure by Port List from the Action drop-down list box. Configure parameters of each interface. c. After completing the configuration, click Apply. The configuration takes effect immediately. To check status of each interface, choose Interface > Port > General and select Show Information from the Action drop-down list box.

Can two interface communicate with each other if one interface works in auto-negotiation mode and the other works in forcible mode
This configuration is not recommended. When this configuration is used, the interface working in auto-negotiation mode changes to half-duplex state according to the auto-negotiation requirements. This reduces the network utilization efficiency and may cause other problems. It is strongly recommended that the local and remote interfaces work in the same mode. That is, they both work in auto-negotiation mode or forcible mode.

Rates on all interfaces working in auto-negotiation mode are different on a WLAN device
When all interfaces of a WLAN device work in auto-negotiation mode, the negotiated rate is the maximum rate supported by the interfaces. However, an interface may negotiate a rate of 100 Mbit/s with a peer interface, while other interfaces negotiate a rate of 1000 Mbit/s with peer interfaces. The possible cause is that the Ethernet cable connecting the GE interfaces on the local and peer devices cannot support a high working rate due to deterioration or RJ-45 connector faults. Therefore, the negotiated rate can only be 100 Mbit/s or 10 Mbit/s. In this case, replace the Ethernet cable.

Can I configure parameters such as rate, auto-negotiation mode, and flow control on interfaces of CE series switches
You can use Interface Query Tool to obtain interface attributes such as the default auto-negotiation status, rate, and support for the auto-negotiation and flow control auto-negotiation configuration based on the interface type and connection medium. To use the interface query tool for CE series switches, visit http://support.huawei.com/onlinetoolsweb/DC/en/interface_query.html.

Why do two GE interfaces work at 100 Mbit/s after auto-negotiation
When the link between the two interfaces is unstable during auto-negotiation, negotiation packets are lost. The two interfaces negotiate a speed in descending order of speeds (1000M->100M->10M). If they work at 100 Mbit/s after the negotiation, the reason is that the link between them is unstable. For example, the network cable is shaking, the RJ45 connector on an end is not properly connected, or the network cable is faulty. To make the two interfaces work at a specified speed, run the auto speed command on the interfaces.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top