Configuring a Default Route
To generate a default external route into the OSPFv3 routing domain, configure the following parameters.
To specify the information for the default route, use the following command.
• Specify the information for the default route.
CONF-IPV6-ROUTER-OSPF mode
default-information originate [always [metric metric-value] [metric-type type-
value]] [route-map map-name]
Configure the following required and optional parameters:
• always: indicate that default route information is always advertised.
• metric metric-value: The range is from 0 to 4294967295.
• metric-type metric-type: enter 1 for OSPFv3 external route type 1 OR 2 for OSPFv3 external
route type 2.
• route-map map-name: enter a name of a configured route map.
Enabling OSPFv3 Graceful Restart
Follow the procedure in this section to configure graceful restart for OSPFv3. By default, OSPFv3 graceful
restart is disabled and functions only in a helper role to help restarting neighbor routers in their graceful
restarts when it receives a Grace LSA.
.
By default, OSPFv3 graceful restart is disabled and functions only in a helper role to help restarting neighbor
routers in their graceful restarts when it receives a Grace LSA.
To enable OSPFv3 graceful restart, enter the ipv6 router ospf process-id command to enter OSPFv3
configuration mode. Then configure a grace period using the
graceful-restart grace-period
command. The grace period is the time that the OSPFv3 neighbors continue to advertise the restarting router
as though it is fully adjacent. When you enable graceful restart (restarting role), an OSPFv3 restarting expects
its OSPFv3 neighbors to help when it restarts by not advertising the broken link.
When you enable the helper-reject role on an interface using the ipv6 ospf graceful-restart
helper-reject command, you reconfigure OSPFv3 graceful restart to function in a restarting-only role.
OSPFv3 does not participate in the graceful restart of a neighbor.
NOTE
: Enter the ipv6 ospf graceful-restart helper-reject command in Interface
configuration mode.
• Enable OSPFv3 graceful restart globally by setting the grace period (in seconds).
CONF-IPV6-ROUTER-OSPF mode
graceful-restart grace-period seconds
The valid values are from 40 to 1800 seconds.
• Configure an OSPFv3 interface to not act on the Grace LSAs that it receives from a restarting OSPFv3
neighbor.
Open Shortest Path First (OSPFv2 and OSPFv3) 755
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