Operation Manual – Port Correlation ConfigurationH3C S5500-EI Series Ethernet Switches Chapter 1 Port Correlation Configuration1-101.1.11 Configuring the Cable Type for an Ethernet PortTwo types of Ethernet cables can be used to connect Ethernet devices: crossovercable and straight-through cable. To accommodate these two types of cables, anEthernet interface on a device can operate in one of the following three MediumDependent Interface (MDI) modes:z Across mode, where the Ethernet interface only accepts crossover cables.z Normal mode, where the Ethernet interface only accepts straight-through cables.z Auto mode, where the Ethernet interface accepts both straight-through cables andcrossover cables.Normally, the auto mode is recommended. The other two modes are useful only whenthe device cannot determine the cable type.Follow these steps to configure the cable type for an Ethernet Port:To do... Use the command... RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Configure the cable typethe Ethernet port canidentifymdi { across | auto |normal }OptionalDefaults to auto. That is,the Ethernet portautomatically detects thetype of the cable in use.Note:10 GE port cannot support mdi configuration.1.1.12 Testing the Cable on an Ethernet PortNote:A link in the up state goes down and then up automatically if you perform the operationdescribed in this section on one of the Ethernet ports forming the link.You can enable the test on the cable connected with an Ethernet port to check:z Whether the RX and TX of the cable are short-circuited.z Whether the cable is open circuited.
