Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 5 IS-IS Configuration5-22To do... Use the command... RemarksConfigure SPF calculationduration spf-slice-size secondsRequiredBy default, SPFcalculation is not sliced.III. Configuring SPF to release CPU resources automaticallyIn IS-IS, SPF calculation may occupy system resources for a long time and slow downconsole response. To avoid this, you can configure SPF to automatically release CPUresources each time a specified number of routes are processed and continue tocalculate the remaining routes after one second.Follow these steps to configure SPF to release CPU resources automatically:To do... Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ tag ] —Configure the interval atwhich SPF releases CPUresourcesspf-delay-intervalnumberRequiredBy default, in IS-IS, SPFreleases CPU resourceseach time it has finishedprocessing 5,000 routes.5.3.24 Enabling/Disabling Packet Transmission Through an InterfaceTo prevent IS-IS routing information from being accessed by a router on anothernetwork, use the silent-interface command to configure the VLAN interfacecontaining the network segment to receive, but not to send, IS-IS packets.Follow these steps to enable/disable packet transmission through an interface:To do... Use the command... RemarksEnter system view system-view —Enter IS-IS view isis [ tag ] —Disable an interface fromsending IS-IS packetssilent-interfaceinterface-typeinterface-numberRequiredBy default, an interface isenabled to receive andsend IS-IS packets.5.3.25 Resetting all IS-IS Configuration DataPerform the following configuration in user view to refresh LSPs immediately.
