database OSPF refresh or clear

clear ospf database purge

https://forums.juniper.net/t5/Routing/clear-ospf-database-purge/td-p/159494

1) The router marks all LSAs as MAXAGE and sends them out.

2) The actual originators of those LSAs now receive these LSAs and re-originate them.

3) Effectively you're refreshing the OSPF database of the whole area.