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D-10
Cisco Wireless ISR and HWIC Access Point Configuration Guide
OL-6415-04
Appendix D Error and Event Messages
802.11 Subsystem Messages
Error Message DOT11-4-BRIDGE_LOOP: Bridge loop detected between WGB [mac-address]
and device [mac-address]
Explanation The indicated workgroup bridge reported the address of one of its indicated Ethernet
clients and the access point already had that address marked as being somewhere else on the
network.
Recommended Action Click Refresh on the Associations page on the access point GUI, or enter the
clear dot11 statistics command on the CLI.
Error Message DOT11-4-ANTENNA_INVALID: Interface [interface], current antenna
position not supported, radio disabled
Explanation The Indicated AIR-RM21A radio module does not support the high-gain position for the
external antenna (the high-gain position is folded flat against the access point). The access point
automatically disables the radio when the antenna is in the high-gain position.
Recommended Action Fold the antenna on the AIR-RM21A radio module so that it is oriented 90
degrees to the body of the access point.
Error Message DOT11-3-RF_LOOPBACK_FAILURE: Interface [interface] Radio failed to
pass RF loopback test
Explanation Radio loopback test failed for the interface indicated.
Recommended Action None.
Error Message DOT11-3-RF_LOOPBACK__FREQ_FAILURE: Interface [interface] failed to
pass RF loopback test
Explanation Radio loopback test failed at a given frequency for the indicated interface.
Recommended Action None.
Error Message DOT11-7-AUTH_FAILED: Station [mac-address] Authentication failed
Explanation The indicated station failed authentication.
Recommended Action Verify that the user entered the correct username and password, and verify that
the authentication server is online.
Error Message DOT11-4-TKIP_MIC_FAILURE: Received TKIP Michael MIC failure report
from the station [mac-address] on the packet (TSC=0x%11x) encrypted and protected
by [key] key.”
Explanation TKIP Michael MIC failure was detected from the indicated station on a unicast frame
decrypted locally with the indicated pairwise key.
Recommended Action A failure of the Michael MIC in a packet usually indicates an active attack on
your network. Search for and remove potential rogue devices from your wireless LAN.