3Com S7906E - Switch, Configuration Manual

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Specifying SPF Calculation Interval
The LSDB changes lead to SPF calculations. When an OSPF network changes frequently, a large
amount of network resources will be occupied, reducing the working efficiency of routers. You can
adjust the SPF calculation interval for the network to reduce negative influence.
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 instance-name ] *
—
Specify SPF calculation
interval(s)
spf-schedule-interval
maximum-interval
[ minimum-interval
[ incremental-interval ] ]
Optional
By default, the interval is 5
seconds.
With this task configured, when network changes are not frequent, SPF calculation applies at the
minimum-interval . If network changes become frequent, SPF calculation interval is incremented by
incremental-interval × 2
n-2
(n is the number of calculation times) each time a calculation occurs, up to
the maximum-interval .
Specifying the LSA Minimum Repeat Arrival Interval
After receiving the same LSA as the previously received LSA within the LSA minimum repeat arrival
interval, an interface discards the LSA.
Follow these steps to configure the LSA minimum repeat arrival interval:
To do… Use the command… Remarks
Enter system view system-view
—
Enter OSPF view
ospf [ process-id | router-id router-id |
vpn-instance instance-name ] *
—
Configure the LSA minimum
repeat arrival interval
lsa-arrival-interval interval
Optional
Defaults to 1000
milliseconds.
The interval set with the lsa-arrival-interval command should be smaller or equal to the interval set
with the lsa-generation-interva l command.