c3750-48PS s not powering up access point

Hi Katrach0,

• Have you tried plugging in the 2802I to another port to see if the port is bad?
• Do you have the correct IP for it?
• How are you trying to access it, e.g. HTTP/S, SSH, etc.?
• Are you on the most current release with the 2802I?

Let me know!

When did it stoo working? Are other access points finding the controller correctly? Is the 2820 on the correct VLAN to find the wireless controller?

Hi Katrach0,

When you say, "...the lights come on..." "...it doesn't come up...", are you talking about the lights on the switchport and are you talking about the 2802I lights.

Also, FYI the 3750-48PS is obsolete (EOL & EOS). You should really consider replacing it.

Is the AP on the same VLAN as the WLC management IP? If not, how are you telling the AP what the WLC IP is? DHCP option 43, DNS, AP priming, etc? Without any of those it won't work if the AP is on a different VLAN.

Trying to answer all of you at the same time.

Yes I tried different ports, trunked and not trunked ports. The AP is supposed to see a Wireless Controller. The AP works in a different switch.

"Are other access points finding the controller correctly?" Yes.

Is the 2820 on the correct VLAN to find the wireless controller? Yes.

"Is the AP on the same VLAN as the WLC management IP?"

We have 30 Access Points and they're all working including the one I'm trying to put to work on this specific switch.  If I take the 2802I to a different switch it will work on a 2960X, but not the c3750-48PS.

Does the AP work on a port where a working AP is located?

Here's the Switch Config. As you can see I have tried different ports, 1, 45, 46 and 47. If I connect computers to this switchs they get the IP they need to get and they can go out the internet.


no aaa new-model
clock timezone UTC -5
clock summer-time UTC recurring
switch 6 provision ws-c3750-48p
system mtu routing 1500
vtp mode transparent


auto qos srnd4
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 10
 name MyVLAN
!
vlan 20
 name MyVLAN2
!
vlan 30
 name Guest
!
vlan 40
 name LAB
!
!
!
interface FastEthernet6/0/1
 description Office AP
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
 
!
interface FastEthernet6/0/2
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/3
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/4
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/5
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/6
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/7
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/8
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/9
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/10
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/11
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/12
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/13
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/14
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/15
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/16
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/17
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/18
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/19
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/20
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/21
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/22
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/23
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/24
 description Access to VLAN 40
 switchport access vlan 40
 switchport mode access
!
interface FastEthernet6/0/25
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/26
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/27
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/28
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/29
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/30
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/31
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/32
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/33
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/34
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/35
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/36
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/37
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/38
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/39
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/40
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/41
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/42
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/43
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/44
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/45
 description New AP
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
!
interface FastEthernet6/0/46
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet6/0/47
 description Office AP
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
 switchport mode trunk
!
interface FastEthernet6/0/48
 description from Core Switch
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 10
 switchport mode trunk
!
interface GigabitEthernet6/0/1
!
interface GigabitEthernet6/0/2
!
interface GigabitEthernet6/0/3
!
interface GigabitEthernet6/0/4
!
interface Vlan1
 no ip address
!
interface Vlan10
 ip address 10.1.11.100 255.255.254.0
!
ip classless
ip http server
ip http authentication local
ip http secure-server

Ok connect the AP to the switch and console to it (the AP). Log the output for 10 minutes and post here, please.

Here it is, it looks obvious the switch doesn't provide the necessary "juice" to the AP.

[*1/9/2018 10:57:20.0607] ethernet_port wired0, ip 10.1.10.90, netmask 255.255.254.0, gw 10.1.10.1, mtu 1500, bcast 10.1.11.255, dns1 10.1.11.2, dns2 10.1.11.3, domain mydomain.lanDOT11_DRV[0]: set_channel Channel set to 11
[*1/9/2018 10:57:21.0008] DOT11_DRV[0]: set_channel Channel set to 11
[*1/9/2018 10:57:22.2591] DOT11_DRV[1]: set_channel Channel set to 36
[*1/9/2018 10:57:22.9453] DOT11_DRV[1]: set_channel Channel set to 36
[*1/9/2018 10:57:27.1046] waiting for POE negotiation to complete
[*1/9/2018 10:57:27.1046]
[*1/9/2018 10:57:32.1051] waiting for POE negotiation to complete
[*1/9/2018 10:57:32.1051]
[*1/9/2018 10:57:37.1056] waiting for POE negotiation to complete
[*1/9/2018 10:57:37.1056]
[*1/9/2018 10:57:42.1061] waiting for POE negotiation to complete
[*1/9/2018 10:57:42.1061]
[*1/9/2018 10:57:47.1066] waiting for POE negotiation to complete
[*1/9/2018 10:57:47.1066]
[*1/9/2018 10:57:52.1071] waiting for POE negotiation to complete
[*1/9/2018 10:57:52.1071]
[*1/9/2018 10:57:55.1362] WTP IP Address = 10.1.10.90
[*1/9/2018 10:57:55.1424] CAPWAP State: Init
[*1/9/2018 10:57:55.1428] CAPWAP State: Discovery
[*1/9/2018 10:57:55.1637] Discovery Request sent to 10.1.11.25 with discovery type set to CAPWAP_DISCOVERY_TYPE_STATIC_CONFIG(1)
[*1/9/2018 10:57:55.1714] Discovery Request sent to 255.255.255.255 with discovery type set to CAPWAP_DISCOVERY_TYPE_UNKNOWN(0)
[*1/9/2018 10:57:55.1715] CAPWAP State: Discovery
[*1/9/2018 10:57:55.1717] Discovery Response from 10.1.11.240
[*1/9/2018 10:57:55.1765] aptrace_add_timer: timer already added
[*01/09/2018 19:43:36.0003] Discovery Response from 10.1.11.25
[*01/09/2018 19:43:36.0306] device capwap0 entered promiscuous mode
[*01/09/2018 19:43:36.0806] device capwap1 entered promiscuous mode
[*01/09/2018 19:43:36.0000] CAPWAP State: DTLS Setup
[*01/09/2018 19:43:39.0230] CAPWAP State: Join
[*01/09/2018 19:43:39.0249] Sending Join request to 10.1.11.25 through port 5264
[*01/09/2018 19:43:43.6113] Join Response from 10.1.11.25
[*01/09/2018 19:43:43.6114] CAPWAP State: Image Data
[*01/09/2018 19:43:43.6115] CAPWAP State: Configure
[*01/09/2018 19:43:44.4112] Radio0 not started, not enough POE power
[*01/09/2018 19:43:45.3720] Radio1 not started, not enough POE power
[*01/09/2018 19:43:46.4727] Radio0 not started, not enough POE power
[*01/09/2018 19:43:46.4730] Radio1 not started, not enough POE power
[*01/09/2018 19:43:46.4734] Radio0 not started, not enough POE power
[*01/09/2018 19:43:46.4738] Radio1 not started, not enough POE power
[*01/09/2018 19:43:46.4782] Radio0 not started, not enough POE power
[*01/09/2018 19:43:47.0577] Radio1 not started, not enough POE power
[*01/09/2018 19:43:47.9962] CAPWAP State: Run
[*01/09/2018 19:43:48.0460] AP has joined controller MyWirelessController

So there's your issue. The port isn't pushing enough power out to the AP. You could reduce the number of ports supporting full POE, or upgrade the power supply.

What would you recommend me doing? I only to connect this one AP to this Switch.

"You could reduce the number of ports supporting full POE"
Wonder how to do this and if it will actually work.

You need to configure the PoE mode to be "never" on some of the ports: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_53_se/configuration/guide/3750xscg/swint.html#wp1875919

Unfortunately reducing the number of devices pulling power won't solve it.

You'll be able to use the AP at reduced functionality as-is but if you want all radios enabled and all MIMO chains available you'll need to use a 802.3at injector or a switch which enables the same (PoE+).

Try running show power inline to show power consumption.

Only suitable answers chosen