• 1 = Type 1 external route
• 2 = Type 2 external route
route-map 
map-
name
(OPTIONAL) Enter the keywords route-map followed by the name 
of an established route map.
Defaults Disabled.
Command Modes ROUTER OSPFv3
Command History
Version 9.1.(0.0) Introduced on the S4810 and Z9000.
Version 7.8.1.0 Added support for C-Series.
Version 7.4.1.0 Introduced on the E-Series.
Related 
Commands
redistribute – redistributes routes from other routing protocols into OSPFv3.
graceful-restart grace-period
Enable OSPFv3 graceful restart globally by setting the grace period (in seconds) that an OSPFv3 router’s neighbors will 
continue to advertise the router as adjacent during a graceful restart.
E-Series TeraScale, Z-Series, S4810
Syntax
graceful-restart grace-period seconds
To disable OSPFv3 graceful restart, enter no graceful-restart grace-period.
Parameters
seconds
Time duration, in seconds, that specifies the duration of the restart 
process before OSPFv3 terminates the process. The range is 40 to 
1800 seconds.
Defaults OSPFv3 graceful restart is disabled and functions in a helper-only role.
Command Modes ROUTER OSPFv3
Command History
Version 9.1.(0.0) Introduced on the S4810 and Z9000.
Version 8.4.2.2 Introduced on the E-Series TeraScale.
Usage 
Information
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, you must enter the ipv6 router ospf command to enter 
OSPFv3 configuration mode and then configure a grace period using the graceful-restart 
grace-period command. The grace period is the length of time that OSPFv3 neighbors continue 
to advertise the restarting router as though it is fully adjacent. When graceful restart is enabled 
(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 with the ipv6 ospf graceful-restart 
helper-reject command, you reconfigure OSPFv3 graceful restart to function in a “restarting-
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