Operation Manual – IPv4 RoutingH3C S7500E Series Ethernet Switches Chapter 3 OSPF Configuration3-34To do… Use the command… RemarksSpecify theretransmissionintervalospf timer retransmitintervalOptionalThe retransmission intervaldefaults to 5 seconds.Note:z The hello and dead intervals restore to default values after you change the networktype for an interface.z The dead interval should be at least four times the hello interval on an interface.z The poll interval is at least four times the hello interval.z The retransmission interval should not be so small for avoidance of unnecessaryLSA retransmissions. In general, this value is bigger than the round-trip time of apacket between two adjacencies.3.7.3 Specifying an LSA Transmission DelaySince OSPF packets need time for traveling on links, extending LSA age time with adelay is necessary, especially for low speed links.Follow these steps to specify an LSA transmission delay on an interface:To do… Use the command… RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —Specify an LSAtransmission delayospf trans-delaysecondsOptional1 second by default3.7.4 Specifying SPF Calculation IntervalThe LSDB changes lead to SPF calculations. When an OSPF network changesfrequently, a large amount of network resources will be occupied, reducing the workingefficiency of routers. You can adjust the SPF calculation interval for the network toreduce negative influence.Follow these steps to configure SPF calculation interval:
