01-25-2018 03:58 PM - edited 07-05-2021 08:09 AM
we buy 4 APs,the PID is AIR-AP3802I-H-K9,we use AIR-PWR-50=,and AP3802 can power up,but when we connect ap to switch,we find
ap wired0 always down,the status as below:
Interface IP-Address Method Status Protocol Speed
wired0 unassigned unset down up n/a
wired1 unassigned unset down down n/a
wifi0 unassigned unset administatively down down n/a
wifi1 unassigned unset administatively down down n/a
This problem is so strange, please help us to see,thx
01-25-2018 04:08 PM - edited 01-25-2018 04:09 PM
@Rps-Cheers wrote:
Jan 24 22:49:22 kernel: [*01/24/2018 22:49:22.4143] Discovery Request sent to 192.168.155.148, discovery type STATIC_CONFIG(1)
I can see the AP booting up to a static IP address of 192.168.155.148.
So what, exactly, is the problem?
What kind of switch is the AP connected to?
What happens if the AP is connected to a computer?
01-26-2018 08:13 PM
The problem is described as follows:
The AP3802 can be up and running normally with AIR-PWR-50 =, but when the mG interface (that is, the POE interface) is connected to the switch, enter show ip interface bri under the console and see the following result:
Interface IP-Address Method Status Protocol Speed
wired0 unassigned unset down up n / a
Switch can be ruled out the problem, because we have other 3802I AP connected 2960,3750,3650 other switches can be normal.
Is this a problem with version? But 8.2.151 is a factory-shipped version, I know other companies are this version of you, but wired0 can be up.
In addition, I saw some people say that the fault version does not match, I do not know if this is not the problem? Will the AP's firmware version should be how to look?
Currently tested 8.5.110.0 version can do the request,However, I think this is not the root cause.
01-26-2018 11:20 PM
01-27-2018 03:14 AM
No, it is this:
1, the AP can be started, but when the POE interface connected to the switch, the AP console "show ip inter bri" shows the down / up
2, AP's wired0 interface is down, then certainly can not get the IP address
3, because the wired0 interface is down, so even if the AP is configured with a static IP address, and the controller will not work.
4, very strange, four new AP3802I are such a problem.
Therefore, the most fundamental reason is that the AP can be powered on (using AIR-PWR-50 =, which is recommended by the official website). However, when the POE interface is connected to the switch, the AP's wired0 interface is down through the CLI
The following is the AP connection switch interface state:
AP # show ip inter bri
Interface IP-Address Method Status Protocol Speed
wired0 unassigned unset down up n / a
Thanks ~
01-27-2018 03:19 AM
01-27-2018 03:25 AM
OK ,
But,what meaning about "<BLAH>"?these commands enter in AP and SW?
AP:test cable tdr interface <BLAH>;
SW:sh cable tdr interface <BLAH>;
01-27-2018 03:41 AM
01-27-2018 03:43 AM
OK,thanks,i will test~
03-14-2018 08:58 PM
03-23-2018 09:50 AM
I am experiencing the same issue. Can you tell us what was the bug or explain how you got this issue resolved?
Thanks in advance for your help
03-23-2018 06:05 PM
03-23-2018 07:37 PM
Thanks for this. I'm going to have a play with this procedure Monday.
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