H3C Technologies H3C S10500 Series Switches - Manual (Page 104)

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To do… Use the command… Remarks
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.
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 must 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 must 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.
Follow these steps to specify the 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 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. Adjust the SPF calculation interval to
reduce the impact.
Follow these steps to configure SPF calculation interval:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPF view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
—
Specify the SPF calculation
interval
spf-schedule-interval maximum-interval
[ minimum-interval
[ incremental-interval ] ]
Optional
By default, the interval is 5
seconds.