H3C Technologies H3C SecPath F1000-E - Manual (Page 432)

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Step Command Remarks
6. Specify the retransmission
interval.
ospf timer retransmit interval
Optional.
The retransmission interval defaults to 5
seconds.
NOTE:
•
The hello and dead intervals restore to default values after you change the network type for an interface.
• The dead interval should be at least four times the hello interval on an interface.
• The poll interval is at least four times the hello interval.
• The retransmission interval should not be so small to avoid unnecessary LSA retransmissions. In general,
this value is bigger than the round-trip time of a packet between two neighbors.
Specifying LSA transmission delay
Each LSA in the LSDB has an age that is incremented by 1 every second, but the age does not change
during transmission. It is necessary to add a transmission delay into the age time especially for low speed
links.
To specify the LSA transmission delay on an interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Specify the LSA transmission
delay.
ospf trans-delay seconds
Optional.
1 second by default.
Specifying SPF calculation interval
LSDB changes lead to SPF calculations. When the topology changes frequently, a large amount of
network and router resources are occupied by SPF calculation. You can adjust the SPF calculation interval
to reduce the impact.
To configure SPF calculation interval:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ] *
N/A
3. Specify the SPF calculation
interval.
spf-schedule-interval
maximum-interval [ minimum-interval
[ incremental-interval ] ]
Optional.
By default, the interval is 5
seconds.
NOTE:
When network changes are not frequent, the minimum-interval is adopted. If network changes become
frequent, the SPF calculation interval is incremented by incremental-interval × 2 n-2 (n is the number of
calculation times) each time a calculation occurs until the maximum-interval is reached.