IS-IS Graceful Restart Commands
This chapter describes the IS-IS graceful restart commands:
capability restart graceful
Use this command to enable the graceful restart capability.
Use the no parameter with this command to negate this command.
Command Syntax
capability restart graceful
no capability restart graceful
Parameters
NA
Default
By default, graceful restart capability is enabled.
Command Mode
Router mode
Applicability
This command was introduced before OcNOS version 1.3.
Example
The following example enables the graceful restart capability on a router.
#configure terminal
(config)#router isis bb
(config-router)#capability restart graceful
isis restart grace-period
Use this command to configure the T3 timer, the time the restarting router retains the forwarding table.
Use the no parameter to use the default value.
Command Syntax
isis restart grace-period <1-65535>
no isis restart grace-period
Parameters
<1-65535>
Grace period in seconds.
Default
By default, ISIS uses 65535 for the period value, and the value is applied to both level-1 and level-2.
Command Mode
Configure mode
Applicability
This command was introduced before OcNOS version 1.3.
Examples
The following example enables and then disables a restart grace period at one second.
#configure terminal
(config)#isis restart grace-period 1
(config)#no isis restart grace-period
isis restart-hello-interval
Use this command to configure the T1 timer, interval of ISIS Hello packet with restart TLV.
Use the no parameter to use the default value.
Command Syntax
isis restart-hello-interval <1-65535> (level-1|level-2|)
no isis restart-hello-interval (level-1|level-2|)
Parameters
<1-65535>
Specify the number of seconds in the interval.
level-1
Specify the hello-interval for level-1 IIHs.
level-2
Specify the hello-interval for level-1 IIHs.
Default
By default, ISIS uses 3 seconds for the hello value, and the interval is applied to both level-1 and level-2.
Command Mode
Interface mode
Applicability
This command was introduced before OcNOS version 1.3.
Example
The following example enables and then disables a restart hello interval at 123 seconds for a level 1 interface.
#configure terminal
(config)#interface eth0
(config-if)#isis restart-hello-interval 123 level-1
(config-if)#no isis restart-hello-interval level-1
isis restart helper
Use this command to configure the router's helper mode capability.
Use the no parameter to disable the helper mode for this router.
Command Syntax
isis restart helper
no isis restart helper
Parameters
None
Default
By default, most routers are not a restart helper router.
Command Mode
Configure mode
Applicability
This command was introduced before OcNOS version 1.3.
Example
The following example enables and then disables ISIS restart helper.
#configure terminal
(config)#isis restart helper
(config)#no isis restart helper
isis restart suppress-adjacency
Use this command to enable ISIS to request that its adjacency be suppressed after the ISIS daemon process starts or restarts until the Link State Packet Database (LSPDB) synchronizes.
Use the no parameter to disable suppress-adjacency.
Command Syntax
isis restart suppress-adjacency
no isis restart suppress-adjacency
Parameters
None
Default
By default, ISIS does not request that its adjacency be suppressed after the ISIS daemon process starts or restarts.
Command Mode
Configure mode
Applicability
This command was introduced before OcNOS version 1.3.
Example
The following example enables and then disables ISIS restart suppress adjacency.
#configure terminal
(config)#isis restart suppress-adjacency
(config)#no isis restart suppress-adjacency
restart isis graceful
Use this command to restart the ISIS router.
Command Syntax
restart isis graceful (grace-period <1-65535>|)
Parameters
<1-65535>
Grace period in seconds.
Default
By default, the ISIS router is not restarted gracefully. Default grace-period is 65535 seconds.
Command Mode
Privileged Exec mode
Applicability
This command was introduced before OcNOS version 1.3.
Example
#restart isis graceful grace-period 60
#restart isis graceful
% Warning : ISISD process will stop and needs to restart manually,
You may loose ISIS configuration, if not saved
Proceed for graceful restart? (y/n):y
restart-timer
Use this command to restart the ISIS T2 timer. When a node comes up after graceful restart, within this time, the LSPDB sync should be completed.
Use the no parameter with this command to negate this command.
Command Syntax
restart-timer <5-65535> (level-1|level-2|)
no restart-timer (level-1|level-2|)
Parameters
<5-65535>
Restart time in seconds
level-1
Restart is only for Level-1.
level-2
Restart is only for Level-2.
Default
The default value is 60 seconds.
Command Mode
Router mode
Applicability
This command was introduced before OcNOS version 1.3.
Example
The following example enables and then disables the restart timer at 555 seconds for a level 2 interface.
#configure terminal
(config)#router isis bb
(config-router)#restart-timer 555 level-2
(config)#router isis bb
(config-router)#no restart-timer level-2