Users Guide

• 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#
Displaying Graceful Restart
To display information on the use and configuration of OSPFv3 graceful restart, enter any of the following
commands.
• Display the graceful-restart configuration for OSPFv2 and OSPFv3 (shown in the following example).
EXEC Privilege mode
show run ospf
• Display the Type-11 Grace LSAs sent and received on an OSPFv3 router (shown in the following example).
EXEC Privilege mode
show ipv6 ospf [vrf vrf-name] database grace-lsa
• Display the currently configured OSPFv3 parameters for graceful restart (shown in the following example).
EXEC Privilege mode
show ipv6 ospf database [vrf vrf-name] database-summary
Examples of the Graceful Restart show Commands
The following example shows the show run ospf command.
Dell#show run ospf
!
router ospf 1
router-id 200.1.1.1
log-adjacency-changes
Open Shortest Path First (OSPFv2) 763