CLI Guide

Layer 3 Routing Commands 1732
OSPF only advertises IP subnets for secondary IP addresses if the secondary
address is within the range of a network area command for the same area as
the primary address on the same interface.
When a network area command is deleted, matching interfaces are
reevaluated against all remaining network area commands.
Ones in the wildcard mask indicate “don't care” bits in the network address.
Example
console(config-router)#network 10.50.50.0 0.0.0.255 area 4
nsf
Use this command to enable OSPF graceful restart. Use the no form of this
command to disable graceful restart.
Syntax
nsf [ietf] [planned-only]
no nsf [ietf]
• ietf — This keyword is used to distinguish the IETF standard
implementation of graceful restart from other implementations. Since the
IETF implementation is the only one supported, this keyword is optional.
• planned-only — This keyword indicates that OSPF should only perform a
graceful restart when the restart is planned (i.e., when the restart is a result
of the initiate failover command).
Default Configuration
Graceful restart is disabled by default
Command Mode
Router OSPF Configuration mode
User Guidelines
Graceful restart works in concert with nonstop forwarding to enable the
hardware to continue forwarding IPv4 packets using OSPFv2 routes while a
backup unit takes over management unit responsibility. When OSPF