H3C Technologies H3C S5560 Series Switches - Manual (Page 101)

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Step Command Remarks
5. Specify the dead
interval.
ospf timer dead seconds
By default:
• The dead interval on P2P and broadcast
interfaces is 40 seconds.
• The dead interval on P2MP and NBMA
interfaces is 120 seconds.
The dead interval must be at least four times the
hello interval on an interface.
The default dead interval is restored when the
network type for an interface is changed.
6. Specify the
retransmission
interval.
ospf timer retransmit interval
The default setting is 5 seconds.
A retransmission interval setting that is too small
can cause unnecessary LSA retransmissions.
This interval is typically set bigger than the
round-trip time of a packet between two
neighbors.
Specifying LSA transmission delay
To avoid LSAs from aging out during transmission, set an LSA retransmission delay 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 The default setting is 1 second.
Specifying SPF calculation interval
LSDB changes result in 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.
For a stable network, the minimum interval is used. If network changes become frequent, the SPF
calculation interval is incremented by the incremental interval × 2
n-2 for each calculation until the
maximum interval is reached. The value n is the number of calculation times.
To configure the 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