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Chapter 24
Configuring NSF with SSO MSFC Redundancy
Purpose
Step 3
Enable NSF operation for IS-IS.
Enter the ietf keyword to enable IS-IS in a
homogeneous network where adjacencies with
networking devices supporting IETF draft-based
restartability is guaranteed.
Enter the cisco keyword to run IS-IS in
heterogeneous networks that might not have
adjacencies with NSF-aware networking devices.
Step 4
(Optional) Specify the minimum time between
NSF restart attempts. The default time between
consecutive NSF restart attempts is 5 minutes.
Step 5
(Optional) Specify the time that IS-IS will wait for
the IS-IS database to synchronize before
generating overloaded link-state information for
itself and flooding that information out to its
neighbors.
The t3 keyword applies only if you selected IETF
operation. When you specify adjacency, the
router that is restarting obtains its wait time from
neighboring devices.
Step 6
(Optional) Specify how long an IS-IS NSF restart
will wait for all interfaces with IS-IS adjacencies
to come up before completing the restart. The
default is 10 seconds.
Verifying IS-IS NSF
To verify IS-IS NSF, you must check that the NSF function is configured on the SSO-enabled networking
device. To verify IS-IS NSF, perform these steps:
Step 1
Verify that "nsf" appears in the IS-IS configuration of the SSO-enabled device by entering the show
running-config command. The display will show either the Cisco IS-IS or the IETF IS-IS configuration.
This example indicates that the device uses the Cisco implementation of IS-IS NSF:
Router# show running-config
<...Output Truncated...>
router isis
nsf cisco
<...Output Truncated...>
If the NSF configuration is set to cisco, enter the show isis nsf command to verify that NSF is enabled
Step 2
on the device. Using the Cisco configuration, the display output will be different on the active and
redundant MSFCs (RPs). This example shows the sample output for the Cisco configuration on the
active MSFC (RP). In this example, note the presence of "NSF restart enabled":
router# show isis nsf
NSF is ENABLED, mode 'cisco'
RP is ACTIVE, standby ready, bulk sync complete
NSF interval timer expired (NSF restart enabled)
Checkpointing enabled, no errors
OL-8978-04
Command
Router(config-router)# nsf [cisco | ietf]
Router(config-router)# nsf interval
[minutes]
Router(config-router)# nsf t3 {manual
[seconds] | adjacency}
Router(config-router)# nsf interface wait
seconds
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Using the CLI to Configure NSF/SSO
24-11
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