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Helper-only: the OSPFv2 router supports graceful-restart only as a helper router.
•
Restart-only: the OSPFv2 router supports graceful-restart only during unplanned restarts.
By default, OSPFv2 supports both restarting and helper roles. Selecting one or the other role restricts
OSPFv2 to the single selected role.
To disable OSPFv2 graceful-restart after you have enabled it, use the no graceful-restart grace-
period command in CONFIG-ROUTEROSPF- id mode. The command returns OSPF graceful-restart to its
default state.
NOTE:
The Helper mode is enabled by default on the device. To enable the restart mode also on the
device, you must configure the grace period using the graceful-restart grace-period command.
After you enable restart mode the router advertises the neighbor as fully adjacent during a restart.
For more information about OSPF graceful restart, refer to the Dell Networking OS Command Line Reference
Guide.
Example of the show run ospf Command
When you configure a graceful restart on an OSPFv2 router, the show run ospf command displays
information similar to the following.
Dell#show run ospf
!
router ospf 1
graceful-restart grace-period 300
graceful-restart role helper-only
graceful-restart mode unplanned-only
graceful-restart helper-reject 10.1.1.1
graceful-restart helper-reject 20.1.1.1
network 10.0.2.0/24 area 0
Dell#
Creating Filter Routes
To filter routes, use prefix lists. OSPF applies prefix lists to incoming or outgoing routes.
Incoming routes must meet the conditions of the prefix lists. If they do not, OSPF does not add the route to
the routing table. Configure the prefix list in CONFIGURATION PREFIX LIST mode prior to assigning it to the
OSPF process.
•
Create a prefix list and assign it a unique name.
CONFIGURATION mode
ip prefix-list prefix-name
You are in PREFIX LIST mode.
•
Create a prefix list with a sequence number and a deny or permit action.
CONFIG- PREFIX LIST mode
seq sequence-number {deny |permit} ip-prefix [ge min-prefix-length] [le max-
prefix-length]
The optional parameters are:
•
ge min-prefix-length: is the minimum prefix length to match (from 0 to 32).
Open Shortest Path First (OSPFv2 and OSPFv3)
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Troubleshooting
