Enables authentication checking for an IS-IS interface.
IS-IS authentication checking is enabled by default.
Interface subtype configuration mode
IS-IS is supported only on devices based on the DNX chipset family. For a list of such devices, see "Supported Hardware".
The no form of the command disables IS-IS authentication checking for an IS-IS interface.
The following example disables IS-IS authentication checking for Level 1 packets for an IS-IS Ethernet interface.
device# configure terminal device(config)# interface ethernet 1/1 device(conf-if-eth-1/1)# isis auth-check disable
The following example re-enables IS-IS authentication checking for Level 2 packets for an IS-IS loopback interface.
device# configure terminal device(config)# interface loopback 1 device(config-Loopback-1)# isis auth-check