171Follow these steps to enable NDP globally and for specific ports:To do… Use the command… RemarksEnter system view system-view —Enable NDP globally ndp enable OptionalEnabled by default.In system view ndp enable interfaceinterface-listinterface interface-typeinterface-numberEnable theNDP feature forthe port(s)In Ethernet interfaceview or Layer 2aggregate interfaceview ndp enableUse either commandBy default, NDP isenabled globally andalso on all ports.NOTE:H3C recommends that you disable NDP on a port which connects with the switches that do not need to jointhe cluster. This prevents the management switch from adding and collecting topology information fromswitches which do not need to joint the cluster.Configuring NDP parametersA port enabled with NDP periodically sends NDP packets to its neighbors. If no NDP information fromthe neighbor is received to reset the holdtime, the holdtime times out and the switch removes thecorresponding entry from the NDP table.Follow these steps to configure NDP parameters:To do… Use the command… RemarksEnter system view system-view —Configure the interval for sendingNDP packets ndp timer hello hello-time Optional60 seconds by default.Configure the period for the receivingswitch to keep the NDP packets ndp timer aging aging-time Optional180 seconds by default.CAUTION:The time for the receiving switch to hold NDP packets cannot be shorter than the interval for sending NDPpackets; otherwise, the NDP table may become instable.Enabling NTDP globally and for specific portsFor NTDP to work normally, you must enable NTDP both globally and on specific ports.Follow these steps to enable NTDP globally and for specific ports:To do… Use the command… RemarksEnter system view system-view —Enable NTDP globally ntdp enable OptionalEnabled by default
