PurposeCommand or Action
Enables IS-IS routing for the specified routing instance, and places the
router in router configuration mode.
router isis instance-id
Example:
RP/0/RSP0/CPU0:router(config)# router
isis isp
Step 2
•
You can change the level of routing to be performed by a particular
routing instance by using the is-type router configuration
command.
Enables NSF on the next restart.nsf { cisco | ietf }
Step 3
Example:
RP/0/RSP0/CPU0:router(config-isis)# nsf
ietf
•
Enter the cisco keyword to run IS-IS in heterogeneous networks
that might not have adjacent NSF-aware networking devices.
•
Enter the ietf keyword to enable IS-IS in homogeneous networks
where all adjacent networking devices support IETF draft-based
restartability.
Configures the number of resends of an acknowledged NSF-restart
acknowledgment.
nsf interface-expires number
Example:
RP/0/RSP0/CPU0:router(config-isis)# nsf
interface-expires 1
Step 4
•
If the resend limit is reached during the NSF restart, the restart
falls back to a cold restart.
Configures the number of seconds to wait for each restart
acknowledgment.
nsf interface-timer seconds
Example:
RP/0/RSP0/CPU0:router(config-isis) nsf
interface-timer 15
Step 5
Configures the maximum route lifetime following an NSF restart.
nsf lifetime seconds
Step 6
Example:
RP/0/RSP0/CPU0:router(config-isis)# nsf
lifetime 20
•
This command should be configured to the length of time required
to perform a full NSF restart because it is the amount of time that
the Routing Information Base (RIB) retains the routes during the
restart.
•
Setting this value too high results in stale routes.
•
Setting this value too low could result in routes purged too soon.
commit
Step 7
(Optional) Displays the entire contents of the currently running
configuration file or a subset of that file.
show running-config [ command ]
Example:
RP/0/RSP0/CPU0:router# show
running-config router isis isp
Step 8
• Verify that “nsf” appears in the IS-IS configuration of the
NSF-aware device.
•
This example shows the contents of the configuration file for the
“isp” instance only.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
369
Implementing IS-IS
Configuring Nonstop Forwarding for IS-IS
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