Configuring authentication

  1. Enter the configure terminal command to access global configuration mode.
    device# configure terminal
  2. Enter the router isis command to enter IS-IS router configuration mode and enable IS-IS on the device.
    device(config)# router isis
    
  3. Enter the auth-mode command with the md5 and level-1 parameters to configure MD5 authentication for Level 1 packets.
    device(config-isis-router)# auth-mode MD5 level-1
    
  4. Enter the auth-check disable command with the level-1 parameter to temporarily disable authentication checking globally for Level 1 packets.
    device(config-isis-router)# auth-check level-1 disable
    
  5. Enter the auth-key command with the level-1 parameters, specifying an authentication password to configure an authentication key globally for Level 1 packets.
    device(config-isis-router)# auth-key level-1 mysecurekey
    
    Note

    Note

    MD5 passwords cannot have ASCII character 32 ('SPACE') as a part of the password string.

The following example configures IS-IS authentication mode, an IS-IS authentication key and temporarily disables IS-IS authentication checking for Level 1 packets.

device# configure terminal
device(config)# router isis
device(config-isis-router)# auth-mode MD5 level-1
device(config-isis-router)# auth-check level-1 disable
device(config-isis-router)# auth-key level-1 mysecurekey