Configuring the IS-IS IPv4 unicast address family

The IS-IS IPv4 unicast address family allows you to configure IPv4 IS-IS unicast settings that are separate and distinct from IPv6 IS-IS unicast settings. The following task enables ISIS IPv4 address family unicast configuration mode where a variety of IS-IS features can be configured.

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
```
Enter the address-family ipv4 unicast command to enable ISIS address-family IPv4 unicast configuration mode.
```
device(config-isis-router)# address-family ipv4 unicast
```

Example

The following example enables ISIS address-family IPv4 unicast configuration mode.

device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv4 unicast
device(config-router-isis-ipv4u)#