isis password password [level-1 | level-2]
no isis [password] [level-1 | level-2]
password Authentication password you assign for an interface. level-1 (Optional) Configures the authentication password for Level 1 independently. For Level 1 routing, the router acts as a station router only. level-2 (Optional) Configures the authentication password for Level 2 independently. For Level 2 routing, the router acts as an area router only.
To configure the authentication password for an interface, use the isis password command in interface configuration mode. To disable authentication for IS-IS, use the no form of this command.
This command is disabled by default.
If no keyword is specified, the default is Level 1 and Level 2.
This command enables you to prevent unauthorized routers from forming adjacencies with this router, and thus protects the network from intruders.
The password is exchanged as plain text and thus provides only limited security.
Different passwords can be assigned for different routing levels using the level-1 and level-2 kewords.
Specifying the level-1 or level-2 keyword disables the password only for Level 1 or Level 2 routing, respectively.
The following example configures a password for Ethernet interface 0 at Level 1:Router(config)# interface ethernet 0 Router(config-if)# isis password frank level-1
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