Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


clear (ospf | ospf3) database


List of Syntax


Syntax (EX Series Switch and QFX Series)


Syntax (EX Series Switch and QFX Series)

Release Information

Command introduced before Junos OS Release 7.4.

advertising-router router-id, netsummary, network, nssa, opaque-area, and router options added in Junos OS Release 8.3. You must use the purge command with these options.

area area-id option added in Junos OS Release 8.3.

Command introduced in Junos OS Release 9.0 for EX Series switches.

realm option added in Junos OS Release 9.2.

advertising-router (router-id | self) option added in Junos OS Release 9.5.

advertising-router (router-id | self) option introduced in Junos OS Release 9.5 for EX Series switches.

Command introduced in Junos OS Release 11.3 for the QFX Series.

Command introduced in Junos OS Release 14.1X53-D20 for the OCX Series.

purge option (and all options that are dependent on the purge option) hidden in Junos OS Release 13.3.


With the master Routing Engine, delete entries in the Open Shortest Path First (OSPF) link-state advertisement (LSA) database. With the backup Routing Engine, delete the OSPF LSA database and sync the new database with the master Routing Engine.


You can also use the purge command with any of the options to discard rather than delete the specified LSA entries. This command is useful only for testing. Use it with care, because it causes significant network disruption.


allDelete all LSAs other than the system’s own LSAs, which are regenerated. To resynchronize the database, the system destroys all adjacent neighbors that are in the state EXSTART or higher. The neighbors are then reacquired and the databases are synchronized.
advertising-router (router-id | self)(Optional) Discard entries for the LSA entries advertised by the specified routing device or by this routing device.
area area-id(Optional) Discard entries for the LSAs in the specified area.
asbrsummary(Optional) Discard summary AS boundary router LSA entries.
external(Optional) Discard external LSAs.
instance instance-name(Optional) Delete or discard entries for the specified routing instance only.
inter-area-prefix(OSPFv3 only) (Optional) Discard interarea prefix LSAs.
inter-area-router(OSPFv3 only) (Optional) Discard interarea router LSAs.
intra-area-prefix(OSPFv3 only) (Optional) Discard intra-area prefix LSAs.
logical-system (all | logical-system-name)(Optional) Perform this operation on all logical systems or on a particular logical system.
link-local(Optional) Delete link-local LSAs.
lsa-id lsa-id(Optional) Discard the LSA entries with the specified LSA identifier.
netsummary(Optional) Discard summary network LSAs.
network(Optional) Discard network LSAs.
nssa(Optional) Discard not-so-stubby area (NSSA) LSAs.
opaque-area(Optional) Discard opaque area-scope LSAs.
realm (ipv4-multicast | ipv4-unicast | ipv6-multicast)(OSPFv3 only) (Optional) Delete the entries for the specified OSPFv3 realm, or address family. Use the realm option to specify an address family for OSPFv3 other than IPv6 unicast, which is the default.
router(Optional) Discard router LSAs.
purge(Optional) Discard all entries in the link-state advertisement database. All link-state advertisements are set to MAXAGE and are flooded. The database is repopulated when the originators of the link-state advertisements receive the MAXAGE link-state advertisements and reissue them.

Required Privilege Level


List of Sample Output

clear ospf database all

Output Fields

When you enter this command, you are provided feedback on the status of your request.

Sample Output

clear ospf database all

user@host> clear ospf database all