H3C Technologies H3C SR8800 - Manual (Page 109)

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Step Command Remarks
3. Specify the hello
interval.
ospf timer hello seconds
Optional.
The hello interval defaults to 10 seconds on P2P
and broadcast interfaces, and defaults to 30
seconds on P2MP and NBMA interfaces.
4. Specify the poll
interval.
ospf timer poll seconds
Optional.
The poll interval defaults to 120 seconds.
5. Specify the dead
interval.
ospf timer dead seconds
Optional.
The default dead interval is 40 seconds on P2P
and broadcast interfaces and 120 seconds on
P2MP and NBMA interfaces.
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: