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Community Member

Cisco Aironet AIR-LAP1142N-E-K9

I am using Cisco Aironet AIR-LAP1142N-E-K9 on my network and it's connected to Gigabitethernet port on my 3750 switch, but for some eason it's neotiating only 100Mbps all time even when I run speed auto from both sides. If I run 1000Mbps from the switch and the AP, I loose connectivity. Please find below details:

Device ID: BTaS-RYD-5F-AP02
Entry address(es): 
  IP address:
Platform: cisco AIR-LAP1142N-E-K9   ,  Capabilities: Trans-Bridge IGMP 
Interface: GigabitEthernet1/0/14,  Port ID (outgoing port): GigabitEthernet0
Holdtime : 138 sec

Version :
Cisco IOS Software, C1140 Software (C1140-K9W7-M), Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)


Output from the switch interface:

Port          Name                        Status          Vlan       Duplex     Speed    Type
Gi1/0/14  ***BTAS-7flr-AP03*   connected    trunk        full          a-100     10/100/1000BaseTX




Hall of Fame Super Gold

Run a TDR on your switch.   I

Run a TDR on your switch.   I am suspecting you've got a faulty cable.  


Do the following commands: 


1.  Command:  test cable tdr interface Gi1/0/14; 

2.  Wait for approximately 5 to 7 seconds to run the test; 

3.  Command:  sh cable tdr interface Gi1/0/14; and 

4.  Post the output to #3.

Community Member

Please find below: BTaS-7F-SW

Please find below:


BTaS-7F-SW-2#test cable-diagnostics tdr interface gi


BTaS-7F-SW-2#test cable-diagnostics tdr interface gigabitEthernet 1/0/14


Link state may be affected during TDR test


TDR test started on interface Gi1/0/14


A TDR test can take a few seconds to run on an interface


Use 'show cable-diagnostics tdr' to read the TDR results.








BTaS-7F-SW-2#show cable-diagnostics tdr ?


  interface  Specify an interface for result




BTaS-7F-SW-2#show cable-diagnostics tdr int gi


BTaS-7F-SW-2#show cable-diagnostics tdr int gigabitEthernet 1/0/14


TDR test last run on: March 10 04:38:17




Interface Speed Local pair Pair length        Remote pair Pair status


--------- ----- ---------- ------------------ ----------- --------------------


Gi1/0/14  100M  Pair A     N/A                N/A         Not Completed


                Pair B     N/A                N/A         Not Completed


                Pair C     N/A                N/A         Not Completed


                Pair D     N/A                N/A         Not Completed






Hall of Fame Super Gold

Link state may be affected

Link state may be affected during TDR test

Uhhhhh ... what ancient IOS are you running????

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