Dell S4820T, Configuration Manual

Page: 707 / 1178

3. Configure the graceful restart role or roles that this OSPFv2 router performs.
CONFIG-ROUTEROSPF- id mode
graceful-restart role [helper-only | restart-only]
Dell Networking OS supports the following options:
•
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
Open Shortest Path First (OSPFv2 and OSPFv3)
707