Enabling IS-IS globally

When IS-IS is enabled on a device, the device enters IS-IS router configuration mode. Several commands can then be accessed that allow the configuration of IS-IS.

About this task

Procedure

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
```
Enter the router isis command to enter IS-IS router configuration mode and enable IS-IS on the device.
```
device(config)# router isis
ISIS: Please configure NET!
```
Enter the net command and specify a NSAP address to configure a NET for IS-IS.
```
device(config-isis-router)# net 49.2211.0000.00bb.cccc.00
```

Example

The following example enables IS-IS on a device.

device# configure terminal
device(config)# router isis
ISIS: Please configure NET!
device(config-isis-router)# net 49.2211.0000.00bb.cccc.00