In the normal OSPF process, OSPF sets the age of the LSA to 30 minutes. When the LSA timer expires, the router flooding / refresh the LSA again. This is to ensure that each router has the updated OSPF database. However, in the pay-per-use link or low-speed link, we sometimes do not want to enable the 30 minutes LSA aging time. We can enable OSPF demand-circuit to help us for this purpose.
The OSPF demand-circuit will set LSA age bit to DONOTAGE value. By setting this the LSA aging process is stopped and no periodic update.
Command
interface s1/1
ip ospf demand-circuit
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