Troubleshooting

Unusual Network Activity

Port A9 shows an "Open" status even though Access Control is set to Unauthorized (Force Auth). This is because the port-access authenticator has not yet been activated.

Figure C-1. Authenticator Ports Remain “Open” Until ActivatedRADIUS server fails to respond to a request for service, even though

the server’s IP address is correctly configured in the switch. Use show radius to verify that the encryption key (RADIUS secret key) the switch is using is correct for the server being contacted. If the switch has only a global key configured, then it either must match the server key or you must configure a server-specific key. If the switch already has a server-specific key assigned to the server’s IP address, then it overrides the global key and must match the server key.

Global RADIUS Encryption Key

Unique RADIUS Encryption Key for the RADIUS server at 10.33.18.119

Also, ensure that the switch port used to access the RADIUS server is not blocked by an 802.1x configuration on that port. For example, show port- access authenticator < port-list> gives you the status for the specified ports. Also, ensure that other factors, such as port security or any 802.1x configura­ tion on the RADIUS server are not blocking the link.

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