Can two electrical interfaces communicate normally when one interface is forcibly configured to work in full duplex mode and the other work in auto-negotiation mode

Publication Date:  2016-11-24 Views:  85 Downloads:  0
Issue Description
Can two electrical interfaces communicate normally when one interface is forcibly configured to work in full duplex mode and the other work in auto-negotiation mode
Solution
According to IEEE 802.3, when electrical interface A in auto-negotiation mode connects to electrical interface B that is forcibly configured to work in full duplex mode, the two interfaces can go Up. However, interface A starts to work in half-duplex mode, and interface B still works in full duplex mode. In this case, the interface working in half-duplex mode encounters error packets and packet loss due to collision of the physical link. Therefore, it is strongly recommended that you configure the interconnected electrical interfaces to work in the same mode. That is, enable auto-negotiation mode on both interfaces or configure the interfaces to work at the same speed and duplex mode by using the following commands:

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] undo negotiation auto
[HUAWEI-GigabitEthernet0/0/1] speed 100
[HUAWEI-GigabitEthernet0/0/1] duplex full

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