Users Guide

• Planned-only — the OSPFv2 router supports graceful-restart for planned restarts only. A planned restart is when you manually
enter a fail-over command to force the primary RPM over to the secondary RPM. During a planned restart, OSPF sends out a
Grace LSA before the system switches over to the secondary RPM. OSPF also is notied that a planned restart is happening.
• Unplanned-only — the OSPFv2 router supports graceful-restart for only unplanned restarts. During an unplanned restart, OSPF
sends out a Grace LSA after the secondary RPM comes online.
By default, OSPFv2 supports both planned and unplanned restarts. Selecting one or the other mode restricts OSPFv2 to the single
selected mode.
3 Congure the graceful restart role or roles that this OSPFv2 router performs.
CONFIG-ROUTEROSPF- id mode
graceful-restart role [helper-only | restart-only]
The system 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.
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 congure 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 lter routes, use prex lists. OSPF applies prex lists to incoming or outgoing routes.
Incoming routes must meet the conditions of the prex lists. If they do not, OSPF does not add the route to the routing table. Congure
the prex list in CONFIGURATION PREFIX LIST mode prior to assigning it to the OSPF process.
• Create a prex list and assign it a unique name.
CONFIGURATION mode
ip prefix-list prefix-name
You are in PREFIX LIST mode.
• Create a prex 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 prex length to match (from 0 to 32).
Open Shortest Path First (OSPFv2 and OSPFv3)
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