3NOTE:Make sure that the fiber port speed matches the speed requirement of the inserted transceiver module. Forexample, after you insert a 1000-Mbps transceiver module into a fiber port, configure the port speed withthe speed 1000 or speed auto command.Shutting down an Ethernet interfaceYou might need to shut down and then bring up an Ethernet interface to activate some configurationchanges, for example, the speed or duplex mode changes.Follow these steps to shut down an Ethernet interface or a group of Ethernet interfaces:To do… Use the command… RemarksEnter system view system-view —Enter Ethernet interfaceview or port group view• Enter Ethernet interface view:interface interface-type interface-number• Enter port group view:port-group manual port-group-nameUse any command.To shut down an Ethernet interface,enter Ethernet interface.To shut down all Ethernet interfaces ina port group, enter port group view.Shut down the Ethernetinterface or interfaces shutdown RequiredBy default, Ethernet interfaces are up.CAUTION:Use this command with caution. After you manually shut down an Ethernet interface, the Ethernet interfacecannot forward packets even if it is physically connected.Setting speed options for auto negotiation on anEthernet interfaceSpeed auto negotiation enables an Ethernet interface to negotiate with its peer for the highest speed thatboth ends support by default. You can narrow down the speed option list for negotiation.
