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Aruba 2530 not enough PoE

Hey! First time posting here and didn't quite know where to open my topic.

 

Anyways here is my problem

 

I set up a few AP305 in a school.

My Aruba 2530 8G PoE has a PoE capacity of 67W.

Aruba AP305 power consumption is 13W worst case scenario.

If my math adds up it should supply 5 AP305 in worst case scenario and yet it supplies only 3 or maybe 4 if I am lucky.

 

Am I missing something? It's messing with my planning and making it kinda akward to explain my customer that he needs to upgrade to a bigger switch.

All these informations have been taken from arubanetworks.com

 

Thanks in advance!

 

Sincerely Kevin

 

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Re: Aruba 2530 not enough PoE

What is the POE budget that the 2530 is reserving for each AP305? I suspect that the 2530 is reserving 15.4W of POE per port (class 3), of which each AP305 will pull a max of 13W (assuming no USB powered devices are used on the 305s). If the switch is reserving a full 15.4W, then the math works out that 4 APs would be supported, assuming no other POE devices on the switch.

 


Charlie Clemmer
Aruba Customer Engineering
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New Contributor

Re: Aruba 2530 not enough PoE

I didn't know it would reserve up up too 15.4W of POE per port.

Is it possible to turn it down so it can support one more unit?

 

But it makes sense that way! Thanks!

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Re: Aruba 2530 not enough PoE


@sysKevinHein wrote:

I didn't know it would reserve up up too 15.4W of POE per port.

Is it possible to turn it down so it can support one more unit?

 

But it makes sense that way! Thanks!


It has to do with how POE needs are signalled (via the standards: 802.3af, 802.3at, and the power class of the device) ... and that the length of cable will attenuate the actual power delivered to the device over distance. 


Charlie Clemmer
Aruba Customer Engineering
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Re: Aruba 2530 not enough PoE

Hi,

 

I've the same issue with my 2530 switchs {HP 2530-48-PoEP Switch (J9778A)}, when I connect a Cisco LWAP 702i they don't work correctly, they register successfully agains the WLC, but de operational radio are down. If I connect the same APs to a Cisco 2960 or 3Com 4500 switch, they work fine.


I changed all parameters about CPD, LLP, PoE.... but without success, and I used a new 1 meter long RJ45 CAT6, but nothing improved.

 

 

 

switch# show system

Software revision : YA.16.10.0002 Base MAC Addr : 98f2b3-438680
ROM Version : YA.15.20 Serial Number : CN77FP32RD

 

 

switch# show power-over-ethernet 43

Status and Configuration Information for port 43

Power Enable : Yes PoE Port Status : Delivering
PLC Class/Type : 3/1 Priority Config : critical
DLC Class/Type : 0/- Pre-std Detect : on
Alloc By Config : usage Configured Type :
Alloc By Actual : usage PoE Value Config : n/a


PoE Counter Information

Over Current Cnt : 0 MPS Absent Cnt : 0
Power Denied Cnt : 0 Short Cnt : 0

 

 

switch# show lldp config 43

LLDP Port Configuration Detail

Port : 43
AdminStatus [Tx_Rx] : Tx_Rx
NotificationEnabled [False] : True
Med Topology Trap Enabled [False] : False


TLVS Advertised:
* port_descr
* system_name
* system_descr
* system_cap
* management_addr

* capabilities
* network_policy
* location_id
* poe

* macphy_config
* poeplus_config
* eee_config
* Port VLAN ID

IpAddress Advertised:

 

 

switch# show lldp info remote-device 43
LLDP Information

PSE Allocated Power Value : 2.7 W PSE TLV Configured : dot3, MED
PD Requested Power Value : 0.0 W PSE TLV Sent Type : dot3
MED LLDP Detect : Disabled PD TLV Sent Type : n/a


Power Information

PSE Voltage : 55.4 V PSE Reserved Power : 2.9 W
PD Amperage Draw : 50 mA PD Power Draw : 2.8 W

 

 

switch# show lldp info remote-device 43

LLDP Remote Device Information Detail

Local Port : 43
ChassisType : local
ChassisId : AP_C01ST1_5
PortType : local
PortId : GigabitEthernet0.1
SysName : cisco AIR-CAP702I-E
System Descr : Cisco IOS Software, ap1g1 Software (ap1g1-K9W8-M), Versio...
PortDescr :
Pvid :

System Capabilities Supported : router
System Capabilities Enabled : router

Remote Management Address
Type : ipv4
Address : 10.50.216.45

------------------------------------------------------------------------------
Local Port : 43
ChassisType : mac-address
ChassisId : 50 06 04 2e f3 60
PortType : interface-name
PortId : Gi0
SysName : AP_C01ST1_5
System Descr : Cisco IOS Software, ap1g1 Software (ap1g1-K9W8-M), Versio...
PortDescr : GigabitEthernet0
Pvid :

System Capabilities Supported :
System Capabilities Enabled :

Remote Management Address
Type : ipv4
Address : 10.50.216.45

 

 

Any idea to help me ??

Thanks !!

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