Enabling IS-IS for IP Routing

When enabling IS-IS, you must create an IS-IS routing process and assign it to specific interfaces rather than to networks. You can specify only a single IS-IS process per router.

To enable IS-IS routing, enter Global Configuration mode, and follow this procedure:

  1. Specify an IS-IS process for IP. In this example, floor12 is specified as the tag name.
    host1(config)#router isis floor12

    The router is now in Router Configuration mode.

  2. Configure a Network Entity Title (NET) for the routing process that specifies the ISO network address.
    host1(config-router)#net 47.0010.0000.0000.0000.0001.0001.1111.1111.1111.00
  3. Enter Interface Configuration mode, and specify the interface that you want to actively route IS-IS.
    host1(config)#interface atm 2/0
  4. Specify the IS-IS process to apply to the interface. Use the same tag name that you specified with the router isis command.
    host1(config-if)#ip router isis floor12

    You can repeat Steps 3 and 4 to apply the IS-IS process to multiple interfaces.

ip router isis

net

router isis

Summary Example

host1(config)#router isis floor12 host1(config-router)#net 47.0010.0000.0000.0000.0001.0001.1111.1111.1111.00 host1(config-router)#exit host1(config)#interface atm 2/0 host1(config-if)#ip router isis floor12 host1(config-router)#exit host1(config-if)#interface atm 2/1 host1(config-if)#ip router isis floor12