Switch 9200 not proving enough power to AP 2802

[ittechk4u1]

Hello Experts,

My Cisco AP 2802 connecte dto 9200-48P swicth and getting only 15.4 watt power.

Here is the output of show power inline command:

Gi1/0/43 auto on 15.4 Ieee PD 4 30.0

SW5#sh power inline gigabitEthernet 1/0/43 detail
Interface: Gi1/0/43
Inline Power Mode: auto
Operational status: on
Device Detected: yes
Device Type: Ieee PD
IEEE Class: 4
Discovery mechanism used/configured: Ieee and Cisco
Police: off

Power Allocated
Admin Value: 30.0
Power drawn from the source: 15.4
Power available to the device: 15.4

Any suggestions?

Thanks in advance.

[Sandeep Choudhary]

Hi,

did you enable cdp on swicth or on port level ? If not then do it and try again.

Regards

Dont forget to rate helpful posts

[Arne Bier]

I was about to reply the same point. Which made me think ... if this relies on CDP, then if you connect the same WAP to a battery pack for a site survey, how do you ensure that the AP gets the correct power? Just curious.

[Scott Fella]

I have a few AP’s from 4802’s to 9100’s connected to Meraki using LLDP and a 3850 using cdp. Power draw shown on my Meraki shows lower than what I typically see on Cisco switches, but on the controller, the aps do show full power. That is where I tend to check it anyways. Funny thing is that I typically have used a batter pack which I have a power injector connected to it to power up any ap that I have used to survey. No matter what, once I have the ap up, I also check to see is the ap is getting full power or not.

[ittechk4u1]

Thank you for your answers but AP is not coming up or not showing in WLC itself.

[Scott Fella]

Well then provide more info. What controller and image, do you have other aps joined and also joined for the same switch? Help us better understand the issue.

[ittechk4u1]

WLC Model:  5520

WLC SW: 8.5.151.0

AP: 2802I

We have three switches in stack and rest of the two switch are working fine.

Only 1st switch is having issue. 

[Scott Fella]

Also, make sure the cabling is good. Test the cable or use the TDR command:

https://community.cisco.com/t5/networking-documents/how-to-use-time-domain-reflectometer-tdr/ta-p/3119327

[ittechk4u1]

here is the tdr result:

SW5#show cable-diagnostics tdr interface gigabitEthernet 1/0/43
TDR test last run on: July 20 08:38:26

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/43 1000M Pair A 2 +/- 10 meters Pair B Normal
                           Pair B 2 +/- 10 meters Pair A Normal
                           Pair C 2 +/- 10 meters Pair C Normal

                           Pair D 2 +/- 10 meters Pair D Normal

[Leo Laohoo]

Post the complete output to the command "sh interface Gi 1/0/43".

[ittechk4u1]

Please find here.

SW5#sh interface Gi 1/0/43
GigabitEthernet1/0/43 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 10b3.d69a.93ab (bia 10b3.d69a.93ab)
Description: *** AP ***
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 6000 bits/sec, 3 packets/sec
1 packets input, 68 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
2361956 packets output, 395238328 bytes, 0 underruns
0 output errors, 0 collisions, 9 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

Thanks

[Leo Laohoo]

---

@ittechk4u1 wrote:

1 packets input
2361956 packets output

---

Look at the major discrepancy between the input vs output packet.  NOTHING is coming into the switch. 
The AP is in u-boot (ROMMON).  

Has anyone tried shut, wait for 10 seconds, no shut the port?

[ittechk4u1]

I tried 4-5 APs and all not coming UP at all.

If I connect these APs in another switch in same stack then its working.

Thanks

[Leo Laohoo]

What firmware is the switch running on?

[ittechk4u1]

16.12.1 (cat9k_lite_iosxe.16.12.01.SPA.bin)