3Com 5500-EI PWR - Configuring the LSA Transmission Delay; Configuring the SPF Calculation Interval

4-23
z Default Hello and Dead timer values will be restored once the network type is changed.
z Do not set an LSA retransmission interval that is too short. Otherwise, unnecessary retransmission
will occur. LSA retransmission interval must be greater than the round trip time of a packet between
two routers.
Configuring the LSA transmission delay
Follow these steps to configure the LSA transmission delay:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—
Configure the LSA
transmission delay
ospf trans-delay seconds
Required
1 second by default
The transmission of OSPF packets on a link also takes time. Therefore, a transmission delay should be
added to the aging time of LSAs before the LSAs are transmitted. For a low-speed link, pay close
attention on this configuration.
Configuring the SPF Calculation Interval
Whenever the LSDB of OSPF is changed, the shortest paths need to be recalculated. When the
network changes frequently, calculating the shortest paths immediately after LSDB changes will
consume enormous resources and affect the operation efficiency of the router. By adjusting the
minimum SPF calculation interval, you can lighten the negative affect caused by frequent network
changes.
Follow these steps to configure the SPF calculation interval:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter OSPF view
ospf [ process-id [ router-id
router-id ] ]
—