Enabling IS-IS point-to-point over Ethernet

1. On Device A, enter the configure terminal command to access global configuration mode.
   

   deviceA# configure terminal

2. Enter the interface ethernet command and specify an interface.
   

   deviceA(config)# interface ethernet 1/2
   

3. Enter the ip router isis command to enable IS-IS for the interface.
   

   deviceA(conf-if-eth-1/2)# ip router isis
   

4. Enter the ip address command and specify an IP address and mask to configure a primary IP address for the interface.
   

   deviceA(conf-if-eth-1/2)# ip address 10.10.1.1/31
   

5. Enter the isis point-to-point command to configure IS-IS point-to-point for the Ethernet interface.
   

   deviceA(conf-if-eth-1/2)# isis point-to-point
   

6. On Device B, enter the configure terminal command to access global configuration mode.
   

   deviceB# configure terminal

7. Enter the interface ethernet command and specify an interface.
   

   deviceB(config)# interface ethernet 2/1
   

8. Enter the ip router isis command to enable IS-IS for the interface.
   

   deviceB(conf-if-eth-2/1)# ip router isis
   

9. Enter the ip address command and specify an IP address and mask to configure a primary IP address for the interface.
   

   deviceB(conf-if-eth-2/1)# ip address 10.10.1.2/31
   

10. Enter the isis point-to-point command to configure IS-IS point-to-point for the Ethernet interface.
    

    deviceB(conf-if-eth-2/1)# isis point-to-point
    

The following example configures two devices, Device A and Device B, for IS-IS point-to-point over Ethernet.

deviceA# configure terminal
deviceA(config)# interface ethernet 1/2
deviceA(conf-if-eth-1/2)# ip router isis
deviceA(conf-if-eth-1/2)# ip address 10.10.1.1/31
deviceA(conf-if-eth-1/2)# isis point-to-point


deviceB# configure terminal
deviceB(config)# interface ethernet 2/1
deviceB(conf-if-eth-2/1)# ip router isis
deviceB(conf-if-eth-2/1)# ip address 10.10.1.2/31
deviceB(conf-if-eth-2/1)# isis point-to-point