Minimum IS-IS Configuration

For IS-IS to run on the routing device, you must enable IS-IS on the routing device, configure a network entity title (NET) on one of the routing device’s interfaces (preferably the loopback interface, lo0), and configure the ISO family on all interfaces on which you want IS-IS to run. When you enable IS-IS, Level 1 and Level 2 are enabled by default. The following is the minimum IS-IS configuration. In the address statement, address is the NET:

interfaces {lo0 {unit logical-unit-number {family iso {address address;}}}interface-type-fpc/pic/port {unit logical-unit-number {family iso;}}}protocols {isis {interface all;}}

Note: To create the IS-IS interface, you must also configure IS-IS at the [edit protocols isis interface interface-name] hierarchy level. If you want the Junos OS to create IS-IS interfaces automatically, include the interface all option at the [edit protocols isis] hierarchy level.