nsf ietf

To configure the Non Stop Forwarding (nsf) features such as strict LSA check option in helper mode, grace period, helper support, graceful restart support, the reason for graceful support, OSPF graceful restart timeout interval, and the maximum number of retransmissions for unacknowledged grace LSA, use the command nsf ietf in OSPF Router Configuration Mode. The no form of the command disables all above mentioned configured features.

nsf ietf

nsf ietf { {helper } { {[gracetimelimit } { <gracelimit period(0-1800)>] } { [softwareRestart] } { [strict-lsa-checking] } { [swReloadUpgrade] } { [switchToRedundant] } { [unknown]} }

{ | helper-support } { {[softwareRestart] } { [swReloadUpgrade] } { [switchToRedundant] } { [unknown]} }

{ | grace } { lsa } { ack } { required }

{ | grlsa } { retrans } { count } { <grlsacout (0-180)> }

{ | restart-interval } { <grace period(1-1800)> }

{ | restart-reason } { {[softwareRestart] } { [swReloadUpgrade] } { [switchToRedundant] } { [unknown]} }

{ | restart-support } { plannedOnly} }

no nsf ietf

no nsf ietf { {helper } { [strict-lsa-checking] }

{ | helper-support } { {[softwareRestart] } { [swReloadUpgrade] } { [switchToRedundant] } { [unknown]} }

{ | grace } { lsa } { ack } { required }

{ | restart-interval }

{ | restart-support }

Parameters

Parameter	Type	Description
`helper`		Enter to enable the helper mode. When a router Y receives a grace-LSA from router X, it enters helper mode for X on the associated network segment. Note: This command executes only if OSPF router is enabled Helper Mode is enabled
`gracetimelimit`		Enter to configure the grace period till which the OSPF router acts as Helper. The router attempting a graceful restart originates link-local Opaque-LSAs, herein called Grace-LSAs, announcing its intention to perform a graceful restart within a specified amount of time or "grace period”. During this period, the router advertises that the restarting router is active and is in FULL state. The value is provided as an intimation of the restart period to the neighbors that do not support graceful restart or that are connected using multipoint interfaces.
`<gracelimit period(0-1800)>`	Integer	Enter a value for the grace period till which the OSPF router acts as Helper. This value ranges from 0 to 1800 seconds. The default is 0.
`softwareRestart`		Enter to configure the helper support for restarting of system due to restart of software.
`strict-lsa-checking`		Enter to enable the strict LSA check option in helper. The strict LSA check option allows the helper to terminate the graceful restart, once a changed LSA that causes flooding during the restart process is detected. The entity should save any change made using this command in a non-volatile storage, as the configuration set using this command is persistent. By default, Strict LSA check option is disabled in helper. Note: This command executes only if OSPF router is enabled Helper Mode is enabled
`swReloadUpgrade`		Enter to configure helper support for restarting of system due to reload or upgrade of software.
`switchToRedundant`		Enter to configure helper support for restarting of system due to switchover to a redundant support processor.
`unknown`		Enter to configure helper support for restarting of system due to unplanned events (such as restarting after a crash).
`helper-support`		Enter to configure helper support. The helper support is enabled for all options if the command is executed without selecting any of the additional options. The helper support can be enabled for more than one option, one after the other. The entity should save any change made using this command in a non-volatile storage, as the configuration set using this command is persistent. By default, Helper support is enabled. Note: This command executes only if OSPF router is enabled
`softwareRestart`		Enter to configure the helper support for restarting of system due to restart of software.
`swReloadUpgrade`		Enter to configure helper support for restarting of system due to reload or upgrade of software.
`switchToRedundant`		Enter to configure helper support for restarting of system due to switchover to a redundant support processor.
`unknown`		Enter to configure helper support for restarting of system due to unplanned events (such as restarting after a crash).
`grace`		Enter to configure graceful restart mode. The grace link-state advertisements (LSAs) sent by the router are expected to be acknowledged by peers, if the graceful restart mode Grace Ack Required state is enabled. The entity should save any change made using this command in a non-volatile storage, as the configuration set using this command is persistent. By default, graceful restart mode Grace Ack Required state is enabled in restarter. Note: This command executes only if OSPF router is enabled
`lsa`		Enter to set the LSA related configuration.
`ack`		Enter to set acknowledgment related configuration.
`required`		Enter to enable acknowledgment related state configuration.
`grlsa`		Enter to configure the maximum number of retransmissions for unacknowledged grace LSA.
`retrans`		Enter for retransmission related configuration.
`count`		Enter to perform counting operation. Note: This command executes only if OSPF router is enabled
`<grlsacout (0-180)>`	Integer	Enter a value for number of retransmission of unacknowledgedGrace LSAs. This value ranges from 0 to 180. The default is 2.
`restart-interval`		Enter to configure the maximum number of retransmissions for unacknowledged grace LSA. This value ranges from 0 to 1800. The default is 120.
`<grace period(1-1800)>`	Integer	Enter a value for maximum number of retransmissions for unacknowledged grace LSA.
`restart-reason`		Enter to configures the reason for graceful restart in the OSPF router. The reason for restart can be software upgrade, scheduled restart or switch to redundant router. The entity should save any change made using this command in a non-volatile storage, as the configuration set using this command is persistent. Note: This command executes only if OSPF router is enabled
`softwareRestart`		Enter to configure restarting of system due to restart of software.
`swReloadUpgrade`		Enter to configure restarting of system due to reload or upgrade of software.
`switchToRedundant`		Enter to configure restarting of system due to switchover to a redundant support processor.
`unknown`		Enter to configure helper restarting of system due to unplanned events (such as restarting after a crash). This is default
`restart-support`		Enter to enable the graceful restart support in OSPF router. Graceful restart support is provided for both unplanned and planned restart, if the command is executed without any option. The graceful restart mechanism allows forwarding of data packets to continue along known routes, while the routing protocol information is being restored following a processor switch over. The entity should save any change made using this command in a non-volatile storage, as the configuration set using this command is persistent. By default, Graceful restart support is disabled. Note: This command executes only if OSPF router is enabled Helper Mode is enabled
`plannedOnly`		Enter to configure support of only planned restarts (suchas restarting a control plane after a planned downtime).

Mode

OSPF Router Configuration Mode

Default

Unknown

Prerequisites

This command executes only if OSPF router is enabled.

Examples

iS5Comm(config)# router ospf

iS5Comm(config-router)# nsf ietf helper gracetimelimit 100

iS5Comm(config-router)# nsf ietf helper strict-lsa-checking

iS5Comm(config-router)# nsf ietf helper-support switchToRedundant

iS5Comm(config-router)# nsf ietf grace lsa ack required

iS5Comm(config-router)# nsf ietf grlsa retrans count 100

iS5Comm(config-router)# nsf ietf restart-interval 200

iS5Comm(config-router)# nsf ietf restart-reason softwareRestart

iS5Comm(config-router)# nsf ietf restart-support