11-14
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 11 Configuring Cisco NSF with SSO Supervisor Engine Redundancy
Configuring NSF with SSO Supervisor Engine Redundancy
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, follow 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 shows either the Cisco IS-IS or the IETF IS-IS
configuration. The following display indicates that the device uses the Cisco implementation of IS-IS
NSF:
Switch# show running-config
<...Output Truncated...>
router isis
nsf cisco
<...Output Truncated...>
Step 2 If the NSF configuration is set to cisco, enter the show isis nsf command to verify that NSF is enabled
on the device. Using the Cisco configuration, the display output differs on the active and redundant RPs.
The following display shows sample output for the Cisco configuration on the active RP. In this example,
note the presence of “NSF restart enabled”:
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# router isis [tag]
Enables an IS-IS routing process, which places the
switch in router configuration mode.
Step 3
Switch(config-router)# nsf [cisco | ietf]
Enables 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
Switch(config-router)# nsf interval [minutes]
(Optional) Specifies the minimum time between
NSF restart attempts. The default time between
consecutive NSF restart attempts is 5 minutes.
Step 5
Switch(config-router)# nsf t3 {manual [seconds] |
adjacency}
(Optional) Specifies the time IS-IS waits 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 switch
that is restarting obtains its wait time from
neighboring devices.
Step 6
Switch(config-router)# nsf interface wait seconds
(Optional) Specifies how long an IS-IS NSF restart
waits for all interfaces with IS-IS adjacencies to
come up before completing the restart. The default
is 10 seconds.
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