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AP power managment

HI All 

 

I have 13 x C9120AXI- aps plugged into a 2960 switch (POE). I am up to maximum watts capacity. 

 

I would like to get one more AP onboarded. 

 

Is there a way of tweaking the APs power on the following WLC  please ?

 


Cisco Catalyst 9800-L Wireless Controller

 

Thanks in Advance 
17.3.3

 

 

1 Accepted Solution

Accepted Solutions

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

Plain 2960 only supports up to 15.4wac. 
Catalyst 9k APs require, at a minimum, >25.0wac.  

Anything below that and the AP will not power up.  

The output from the command "sh power inline" shows the switch has ran out of PoE allowance.  

There is nothing else to be done except get another switch or get a switch that is "FP" (higher PoE allowance of 750wac vs the current one of 375wac).

View solution in original post

11 Replies 11

balaji.bandi
VIP Guru VIP Guru
VIP Guru

Can you post the Cat 2960 switch port config where the AP conected ?

 

also post from switch -

show version

show power inline

 

some Syntax may help you :

 

Step 3 

power inline {auto [max max-wattage] | never | static [max max-wattage]}

Configure the PoE mode on the port. The keywords have these meanings:

auto—Enable powered-device detection. If enough power is available, automatically allocate power to the PoE port after device detection. This is the default setting.

 

(Optional) max max-wattage—Limit the power allowed on the port. The range is 4000 to 15400 milliwatts. If no value is specified, the maximum is allowed (15400 milliwatts).

 

never—Disable device detection, and disable power to the port.

Note

 

If a port has a Cisco powered device connected to it, do not use the power inline never command to configure the port. A false link-up can occur, placing the port into an error-disabled state.

 

static—Enable powered-device detection. Pre-allocate (reserve) power for a port before the switch discovers the powered device. The switch reserves power for this port even when no device is connected and guarantees that power will be provided upon device detection.

The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode.

 

BB

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interface GigabitEthernet1/0/18
switchport access vlan 6
switchport trunk native vlan 6
switchport mode trunk
switchport nonegotiate
spanning-tree portfast trunk
end

NWGB-H2P-APSW01#sh int g1/0/18
GigabitEthernet1/0/18 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 00ca.e5ba.5812 (bia 00ca.e5ba.5812)
MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (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 0 bits/sec, 0 packets/sec
0 packets input, 0 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
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 1 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

what is the output :

show power inline

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(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 370.0 360.8 9.2
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto off 0.0 n/a n/a 30.0
Gi1/0/2 auto off 0.0 n/a n/a 30.0
Gi1/0/3 auto off 0.0 n/a n/a 30.0
Gi1/0/4 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/5 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/6 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/7 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/8 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/9 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/10 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/11 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/12 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/13 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/14 auto off 0.0 n/a n/a 30.0
Gi1/0/15 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/16 auto on 15.4 C9120AXI-E 4 30.0
Gi1/0/17 auto on 15.4 C9120AXI-E 4 30.0
Gi1/0/18 auto power-deny 0.0 n/a n/a 30.0
Gi1/0/19 auto off 0.0 n/a n/a 30.0
Gi1/0/20 auto off 0.0 n/a n/a 30.0
Gi1/0/21 auto off 0.0 n/a n/a 30.0
Gi1/0/22 auto off 0.0 n/a n/a 30.0
Gi1/0/23 auto off 0.0 n/a n/a 30.0
Gi1/0/24 auto off 0.0 n/a n/a 30.0
Gi1/0/25 auto off 0.0 n/a n/a 30.0
Gi1/0/26 auto off 0.0 n/a n/a 30.0
Gi1/0/27 auto off 0.0 n/a n/a 30.0
Gi1/0/28 auto off 0.0 n/a n/a 30.0
Gi1/0/29 auto off 0.0 n/a n/a 30.0
Gi1/0/30 auto off 0.0 n/a n/a 30.0
Gi1/0/31 auto off 0.0 n/a n/a 30.0
Gi1/0/32 auto off 0.0 n/a n/a 30.0
Gi1/0/33 auto off 0.0 n/a n/a 30.0
Gi1/0/34 auto off 0.0 n/a n/a 30.0
Gi1/0/35 auto off 0.0 n/a n/a 30.0
Gi1/0/36 auto off 0.0 n/a n/a 30.0
Gi1/0/37 auto off 0.0 n/a n/a 30.0
Gi1/0/38 auto off 0.0 n/a n/a 30.0
Gi1/0/39 auto off 0.0 n/a n/a 30.0
Gi1/0/40 auto off 0.0 n/a n/a 30.0
Gi1/0/41 auto off 0.0 n/a n/a 30.0
Gi1/0/42 auto off 0.0 n/a n/a 30.0
Gi1/0/43 auto off 0.0 n/a n/a 30.0
Gi1/0/44 auto off 0.0 n/a n/a 30.0
Gi1/0/45 auto off 0.0 n/a n/a 30.0
Gi1/0/46 auto off 0.0 n/a n/a 30.0
Gi1/0/47 auto off 0.0 n/a n/a 30.0
Gi1/0/48 auto off 0.0 n/a n/a 30.0

as per the output, as you mentioned you are out of power.

 

but one of the surprising was, same model AP different PoE consumption :

 

Gi1/0/15 auto on 30.0 C9120AXI-E 4 30.0
Gi1/0/16 auto on 15.4 C9120AXI-E 4 30.0
Gi1/0/17 auto on 15.4 C9120AXI-E 4 30.0

 

Do you see different config on the switch ports gi 1/0/16 and 17 compare to gi 1/0/15?

 

as other post given informaiton based on the AP power consumption listed in Datasheet for reference :

 

https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9120ax-series-access-points/datasheet-c78-742115.html

 

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No difference in port config

I don't think you want to try to tweak anything that can cause you issues latter on.  Why not just buy a power injector or better yet, get another switch that you can use in the future for ap's or other PoE devices.

-Scott
*** Please rate helpful posts ***

not sure what model of switch, uplift the PSU to get more device added, rather overload.

 

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960xr/hardware/installation/guide/b_c2960xr_hig/m_pwr_sup_install_hig.html

 

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Kasun Bandara
VIP Advocate VIP Advocate
VIP Advocate

Hi,

these are the power consumptions guide for this AP. you have to adhere with that and do tweaks.

PoE power consumption

2.4-GHz radio

5-GHz radio

Link speed

USB

LLDP

802.3at (PoE+)

4x4

4x4

2.5G

Y

25.5W

 
           
           

Catalyst 9120AXI, 9120AXE, 9120AXP

PoE power consumption

2.4-GHz radio

5-GHz radio

Link speed

USB

LLDP

802.3af

PoE

1x1

1x1

1G

N

13.4W

802.3af

PoE

2x2

N

1G

N

13.4W

802.3af

PoE

N

2x2

1G

N

13.4W

Please rate this and mark as solution/answer, if this resolved your issue
Good luck
KB

jagan.chowdam
Participant
Participant

These are the flexible power options for Cat 9120 APs.

 

AP Model

Power source

Power Type

2.4 GHz Radio

5 GHz Radio

Link Speed

USB

Power Draw

C9120AXI / C9120AXE

802.3at

PoE+

4x4

4x4

2.5G

ON

25.5W

C9120AXI / C9120AXE

802.3af

PoE

1x1

1x1

1G

OFF

13.4 W

C9120AXI / C9120AXE

802.3af

PoE

2x2

N

1G

OFF

13.4 W

C9120AXI / C9120AXE

802.3af

PoE

N

2x2

1G

OFF

13.4 W

 

If possible move APs to different switch, so that you don't degrade AP performance. 

 

If you add an extra AP, it may not get required power. You may try rebooting couple of existing APs with 30w power consumption once you add the new AP and they may come up with PoE power and the new AP gets enough power to run. Not tested, but you can try.

 

CJ

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

Plain 2960 only supports up to 15.4wac. 
Catalyst 9k APs require, at a minimum, >25.0wac.  

Anything below that and the AP will not power up.  

The output from the command "sh power inline" shows the switch has ran out of PoE allowance.  

There is nothing else to be done except get another switch or get a switch that is "FP" (higher PoE allowance of 750wac vs the current one of 375wac).

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