12.3 Description of neighboring router authentication
In OSPF, you can use authentication to verify that the sender and recipient of routing updates are managed by the same entity. By using authentication between neighboring routers, you can defend an authenticating router from attacks involving false route updates.
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Authentication method
You can perform authentication using either a plain-text password or an MD5 digest.
In the switch configuration, you can specify an authentication method at the area level or the interface level. If you specify neither, the switch does not participate in authentication. Moreover, an interface for which an authentication method is specified but not an authentication key does not participate in authentication. A virtual link will use the authentication method specified for area 0.
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