Please check attached logs and sh command output. We are using yagi antenna,Antenna gain 13 db power and channel setting is least congested channel between channel 1 2412 Mhz to channel 11 2462 Mhz. could you tell us how to check potential interference on the channels. Root Bridge: PMC-RF#ping 10.1.254.253 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.1.254.253, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 2/202/1001 ms PMC-RF#show dot11 stat cli Clients: 6-0014.f28d.b972 pak in 600 bytes in 187288 pak out 145693 bytes out 16912435 dup 0 decrpyt err 0 mic mismatch 0 mic miss 0 tx retries 84033 data retries 82901 rts retries 1132 signal strength 72 signal quality N/A PMC-RF#show dot11 carrier busy PMC-RF#show dot11 carrier busy PMC-RF# PMC-RF#sh dot11 stat client Clients: 8-0014.f28d.b972 pak in 395 bytes in 40114 pak out 7911 bytes out 886000 dup 0 decrpyt err 0 mic mismatch 0 mic miss 0 tx retries 2056 data retries 2008 rts retries 48 signal strength 67 signal quality N/A PMC-RF#sh dot11 stat client Clients: 8-0014.f28d.b972 pak in 396 bytes in 40206 pak out 7930 bytes out 888002 dup 0 decrpyt err 0 mic mismatch 0 mic miss 0 tx retries 2058 data retries 2010 rts retries 48 signal strength 67 signal quality N/A PMC-RF#sh dot11 stat client Clients: 8-0014.f28d.b972 pak in 396 bytes in 40206 pak out 7937 bytes out 888718 dup 0 decrpyt err 0 mic mismatch 0 mic miss 0 tx retries 2058 data retries 2010 rts retries 48 signal strength 67 signal quality N/A NON ROOT BridgeL: PMC-RF#show dot11 stat cli Clients: 1-0017.0ec6.6890 pak in 423710 bytes in 62405770 pak out 694 bytes out 195866 dup 22 decrpyt err 0 mic mismatch 0 mic miss 0 tx retries 654 data retries 649 rts retries 5 signal strength 68 signal quality N/A PMC-RF#show dot11 carrier busy PMC-RF# Logs: Log Buffer (4096 bytes): te (2) not valid *Mar 15 00:36:59.901: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down *Mar 15 00:37:00.901: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down *Mar 15 00:37:10.711: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associate: No Response *Mar 15 00:37:14.177: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP PMC-RF 0017.0ec6.6890 [None] *Mar 15 00:37:14.178: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 15 00:37:15.178: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up *Mar 16 04:00:18.329: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid *Mar 16 04:00:18.331: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down *Mar 16 04:00:19.331: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down *Mar 16 04:00:29.265: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associate: No Response *Mar 16 06:09:34.714: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP PMC-RF 0017.0ec6.6890 [None] *Mar 16 06:09:34.715: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 16 06:09:35.715: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up *Mar 17 14:52:14.791: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid *Mar 17 14:52:14.792: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down *Mar 17 14:52:15.792: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down *Mar 17 14:52:25.608: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associate: No Response *Mar 17 14:53:47.261: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP PMC-RF 0017.0ec6.6890 [None] *Mar 17 14:53:47.262: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 17 14:53:48.262: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up *Mar 17 23:05:37.234: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid *Mar 17 23:05:37.235: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down *Mar 17 23:05:37.945: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP PMC-RF 0017.0ec6.6890 [None] *Mar 17 23:05:37.946: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 17 23:12:03.334: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid *Mar 17 23:12:03.335: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down *Mar 17 23:12:04.335: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down *Mar 17 23:12:13.604: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associate: No Response *Mar 17 23:12:28.126: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP PMC-RF 0017.0ec6.6890 [None] *Mar 17 23:12:28.127: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 17 23:12:29.127: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up *Mar 17 23:22:49.630: %DOT11-4-UPLINK_DOWN: Interface Dot11Radio0, parent lost: Received deauthenticate (2) not valid *Mar 17 23:22:49.631: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to down *Mar 17 23:22:50.632: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down *Mar 17 23:22:59.649: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associate: No Response *Mar 18 00:08:25.830: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associate: Rcvd response from 0017.0ec6.6890 channel 11 2577 *Mar 18 00:08:26.559: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associated To AP PMC-RF 0017.0ec6.6890 [None] *Mar 18 00:08:26.560: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 18 00:08:27.561: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up *Mar 18 01:32:05.795: %SYS-5-CONFIG_I: Configured from console by Cisco on vty3 (172.25.12.184) *Mar 1 02:02:10.796: %DOT11-6-ASSOC: Interface Dot11Radio0, Station PMC-RF 0014.f28d.b972 Reassociated KEY_MGMT[NONE] *Mar 1 02:15:31.790: %DOT11-4-MAXRETRIES: Packet to client 0014.f28d.b972 reached max retries, removing the client *Mar 1 02:15:31.791: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0014.f28d.b972 Reason: Previous authentication no longer valid *Mar 1 02:16:26.328: %DOT11-6-ASSOC: Interface Dot11Radio0, Station PMC-RF 0014.f28d.b972 Reassociated KEY_MGMT[NONE] *Mar 1 02:16:40.972: %DOT11-4-MAXRETRIES: Packet to client 0014.f28d.b972 reached max retries, removing the client *Mar 1 02:16:40.972: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0014.f28d.b972 Reason: Previous authentication no longer valid *Mar 1 02:17:10.381: %DOT11-6-ASSOC: Interface Dot11Radio0, Station PMC-RF 0014.f28d.b972 Reassociated KEY_MGMT[NONE] *Mar 1 02:36:47.335: %DOT11-4-MAXRETRIES: Packet to client 0014.f28d.b972 reached max retries, removing the client *Mar 1 02:36:47.336: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0014.f28d.b972 Reason: Previous authentication no longer valid *Mar 1 02:40:29.782: %DOT11-6-ASSOC: Interface Dot11Radio0, Station PMC-RF 0014.f28d.b972 Reassociated KEY_MGMT[NONE] PMC-RF# show dot11 stat cli Clients: PMC-RF# show dot11 stat cli Clients: PMC-RF#show dot11 stat cli Clients: 4-0014.f28d.b972 pak in 14 bytes in 1856 pak out 136 bytes out 14978 dup 0 decrpyt err 0 mic mismatch 0 mic miss 0 tx retries 68 data retries 68 rts retries 0 signal strength 70 signal quality N/A PMC-RF#sh log Syslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled) Console logging: level debugging, 21 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 23 messages logged, xml disabled, filtering disabled Logging Exception size (4096 bytes) Count and timestamp logging messages: disabled Trap logging: level informational, 27 message lines logged Log Buffer (4096 bytes): *Mar 1 00:00:03.562: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset *Mar 1 00:00:03.562: %DOT11-4-LOADING_RADIO: Interface Dot11Radio0, loading the radio firmware (flash:/c1310-k9w7-mx.123-7.JA2/5501.img) *Mar 1 00:00:06.486: %SYS-6-LOGGERSTART: Logger process started *Mar 1 00:00:06.488: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to up *Mar 1 00:00:06.865: %SYS-5-CONFIG_I: Configured from memory by console *Mar 1 00:00:06.866: %SYS-5-RESTART: System restarted -- Cisco IOS Software, C1310 Software (C1310-K9W7-M), Version 12.3(7)JA2, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2005 by Cisco Systems, Inc. Compiled Fri 18-Nov-05 12:55 by ssearch *Mar 1 00:00:06.866: %SNMP-5-COLDSTART: SNMP agent on host PMC-RF is undergoing a cold start *Mar 1 00:00:07.024: %DOT11-6-FREQ_SCAN: Interface Dot11Radio0, Scanning frequencies for 22 seconds *Mar 1 00:00:07.488: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up *Mar 1 00:00:07.721: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to up *Mar 1 00:00:07.884: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down *Mar 1 00:00:11.296: %DOT11-6-RADIO_TEMPERATURE_NORMAL: Interface Dot11Radio0 radio temperature returned to normal *Mar 1 00:00:11.303: %DOT11-6-FREQ_SCAN: Interface Dot11Radio0, Scanning frequencies for 22 seconds *Mar 1 00:00:33.053: %DOT11-6-FREQ_USED: Interface Dot11Radio0, frequency 2462 selected *Mar 1 00:00:33.059: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up *Mar 1 00:00:34.059: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up *Mar 1 00:00:38.447: %DOT11-6-ASSOC: Interface Dot11Radio0, Station PMC-RF 0014.f28d.b972 Reassociated KEY_MGMT[NONE] *Mar 1 00:28:31.612: %DOT11-6-ADD: Interface Dot11Radio0, Station 000f.2454.03e1 Associated to Parent 0014.f28d.b972 *Mar 1 00:43:51.751: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 000f.2454.03e1 *Mar 1 01:27:59.562: %SYS-5-CONFIG_I: Configured from console by Cisco on vty0 (172.25.12.184) *Mar 1 01:31:57.002: %DOT11-4-MAXRETRIES: Packet to client 0014.f28d.b972 reached max retries, removing the client *Mar 1 01:31:57.003: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station 0014.f28d.b972 Reason: Previous authentication no longer valid *Mar 1 01:32:01.221: %DOT11-6-ASSOC: Interface Dot11Radio0, Station PMC-RF 0014.f28d.b972 Reassociated KEY_MGMT[NONE]