3com S7906E Manuel De Montage

 

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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: 

Enter 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. 

 

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: 

Enter 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-interval command.