H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 3 OSPF Configuration
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To do… Use the command… Remarks
Specify the
retransmission
interval
ospf timer retransmit
interval
Optional
The retransmission interval
defaults to 5 seconds.
 Note:
z The hello and dead intervals restore to default values after you change the network
type 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 unnecessary
LSA retransmissions. In general, this value is bigger than the round-trip time of a
packet between two adjacencies.
3.7.3 Specifying an LSA Transmission Delay
Since OSPF packets need time for traveling on links, extending LSA age time with a
delay is necessary, especially for low speed links.
Follow these steps to specify an LSA transmission delay on an interface:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—
Specify an LSA
transmission delay
ospf trans-delay
seconds
Optional
1 second by default
3.7.4 Specifying SPF Calculation Interval
The LSDB changes lead to SPF calculations. When an OSPF network changes
frequently, a large amount of network resources will be occupied, reducing the working
efficiency of routers. You can adjust the SPF calculation interval for the network to
reduce negative influence.
Follow these steps to configure SPF calculation interval: