The switch does not receive a response to RADIUS authentication requests................. 465
The switch does not authenticate a client even though the RADIUS server is properly
configured and providing a response to the authentication request.................................465
During RADIUS-authenticated client sessions, access to a VLAN on the port used for
the client sessions is lost..................................................................................................465
The switch appears to be properly configured as a supplicant, but cannot gain access
to the intended authenticator port on the switch to which it is connected........................ 466
The supplicant statistics listing shows multiple ports with the same authenticator MAC
address.............................................................................................................................466
The show port-access authenticator <port-list> command shows one
or more ports remain open after they have been configured with control
unauthorized ...............................................................................................................466
RADIUS server fails to respond to a request for service, even though the server's IP
address is correctly configured in the switch....................................................................466
The authorized MAC address on a port that is configured for both 802.1X and port
security either changes or is re-acquired after execution of aaa port-access
authenticator <port-list> initialize ..........................................................467
A trunked port configured for 802.1X is blocked.............................................................. 467
QoS-related problems................................................................................................................. 467
Loss of communication when using VLAN-tagged traffic................................................. 467
Radius-related problems............................................................................................................. 467
The switch does not receive a response to RADIUS authentication requests................. 467
RADIUS server fails to respond to a request for service, even though the server's IP
address is correctly configured in the switch....................................................................468
MSTP and fast-uplink problems.................................................................................................. 468
Broadcast storms appearing in the network..................................................................... 468
STP blocks a link in a VLAN even though there are no redundant links in that VLAN.....468
Fast-uplink troubleshooting.............................................................................................. 469
SSH-related problems.................................................................................................................469
Switch access refused to a client..................................................................................... 469
Executing IP SSH does not enable SSH on the switch....................................................469
Switch does not detect a client's public key that does appear in the switch's public
key file (show ip client-public-key) ....................................................................469
An attempt to copy a client public-key file into the switch has failed and the switch
lists one of the following messages..................................................................................469
Client ceases to respond ("hangs") during connection phase..........................................470
TACACS-related problems..........................................................................................................470
Event Log......................................................................................................................... 470
All users are locked out of access to the switch...............................................................470
No communication between the switch and the TACACS+ server application................ 470
Access is denied even though the username/password pair is correct............................471
Unknown users allowed to login to the switch..................................................................471
System allows fewer login attempts than specified in the switch configuration................471
TimeP, SNTP, or Gateway problems........................................................................................... 471
The switch cannot find the time server or the configured gateway.................................. 471
VLAN-related problems...............................................................................................................471
Monitor port...................................................................................................................... 471
None of the devices assigned to one or more VLANs on an 802.1Q-compliant switch
are being recognized........................................................................................................472
Link configured for multiple VLANs does not support traffic for one or more VLANs.......472
Duplicate MAC addresses across VLANs........................................................................ 472
Disabled overlapping subnet configuration...................................................................... 473
Fan failure................................................................................................................................... 474
Mitigating flapping transceivers...................................................................................................474
Fault-finder link-flap .........................................................................................................475
Show fault-finder link-flap................................................................................................. 477
Contents 17
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