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Configuring Authentication for Hello Packets

You can configure authentication configure authentication for a given IS-IS level on an interface. On a point-to-point link, if you enable hello authentication for both IS-IS levels, the password configured for Level 1 is used for both levels.

Caution: If no authentication is configured for Level 1on a point-to-point link with both levels enabled, the hello packets are sent without any password, regardless of the Level 2 authentication configurations.

By default, hello authentication is not configured on an interface. However, if IS-IS authentication is configured, the hello packets are authenticated using the IS-IS authentication type and password.

To enable hello authentication for an IS-IS level on an interface and define the password, include the hello-authentication-type and hello-authentication-key statements:




hello-authentication-type (md5 | simple);

hello-authentication-key password;

For a list of hierarchy levels at which you can include these statements, see the statement summary sections for these statements.

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