EAP Changed IP address, Log Entry

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EAP Changed IP address, Log Entry

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Re:EAP Changed IP address, Log Entry
2020-09-12 15:56:07

 

R1D2 wrote

@Bobby1859,

 

yes, you will see a disconnect state after few minutes.

 

Does your PoE switch provide an af or an at power budget?

@R1D2 

This switch is a TP-Link 5 port Gb switch with PoE (TL-SG1005P).  it's 802.3af power, 56 Watts total, and 15.4W per port across I think four ports, the total not to exceed the 56W max.  We have just one PoE device on this switch, the EAP245 which consumes 12.7W according to its specs which also state that it's compatible with 802.3af.  So, we should be within the switch's power specs.   

 

We swapped that switch for another TP-Link Gb switch with no PoE and used the power injector included with the EAP345 instead.  I made that change 10 days ago and have seen none of these "EAP changed IP address" messages for this EAP since.  Could this mean that the PoE switch is under delivering power vs its specs, or that the EAP is over consuming power?   That's hard to believe.  

 

Elsewhere in the building, we have an identical setup, same PoE switch and same EAP245.  Here, we see the same log message, but far fewer of them.  This EAP is in an area not used for our online classes. So I'm not too concerned about this one, but it's interesting that we have the same symptoms in two different locations.  The Wi-Fi volume in this area is insignificant compared to the up and down streaming going on in the classrooms, so maybe that accounts for the fewer log messages.  

 

Thanks

 

 

 

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#12
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Re:EAP Changed IP address, Log Entry
2020-09-12 17:06:21 - last edited 2020-09-12 17:18:11

 

Bobby1859 wrote

it's 802.3af power, 56 Watts total, and 15.4W per port across I think four ports, the total not to exceed the 56W max.  We have just one PoE device on this switch, the EAP245 which consumes 12.7W according to its specs which also state that it's compatible with 802.3af.

 

According to IEEE 802.3af the power budget of 15.4W is the max. power for the Power Source Equipment (PSE). Max. power budget available for the Powered Device (PD) is 12.95W depending on the actual loss of energy over the cable and connectors.

 

I remember that EAP245 v1 once required 802.3at as per the specs. That was the reason why we did use EAP225 instead. We want to use fan-less 802.3af PoE switches, not noisy 802.3at PoE switches.

 

Now, for EAP245 v3 the requirement is 802.3af on the international web site:

 

 

But still requires 802.3at according to the german web site. That might be wrong, but personally I would use an 802.3at PoE switch for a 12.7W PD such as an EAP245. There should always be some headroom for the power budget of a PD.

 

 

 

However, the TL-SG1005P v2 has 802.3at compatible PoE+ ports, while TL-SG1005P v1 has 802.3af PoE ports only.

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#13
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Re:EAP Changed IP address, Log Entry
2020-09-12 19:48:36

@R1D2 

 

I believe this link below contains the specs for US customers.

 

https://www.tp-link.com/us/business-networking/omada-sdn-access-point/eap245/

 

In the forth bullet on the first page it clearly states:

  • Support Power over Ethernet(802.3at/802.3af) for convenient and affordable installation

 

In about the fouth page, there's a photo showing the two ethernet ports with the following description

 

Multiple PoE Options for Easy Installation

EAP245 supports both 802.3af PoE and Passive PoE power supply, can be either powered by a PoE switch or the provided PoE adapter. The addition of elegant appearance and simple mounting design for easy attachment to a wall or ceiling further makes deployment effortless and flexible.

 

Gigabit Ethernet Port 802.3af PoE/ 48V Passive PoE

 

However,  on Amazon (where I have bought several),  I saw two listings for the 245 V3.  One states what I provided above and the other states at, or PoE+, is required.

So, maybe TP-Link has old, out of date specs out there.  

 

We need new switches anyway to increase the number of ports.  So, I'll make sure they're always PoE+ going forward.  

 

Thanks,

 

 

 

 

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#14
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Re:EAP Changed IP address, Log Entry
2020-09-14 09:21:43 - last edited 2020-09-25 02:00:42

Dear @Bobby1859,

 

The EAP245 V3 supports both 802.3af and 802.3at, while EAP245 V1 only supports 802.3at.

 

The difference between the IEEE 802.3af and IEEE 802.3at is about the maximum power delivered by the PSE, 15.4W for 802.3af and 30.0W for 802.3at. A typical PoE system consists of a PSE and a PD. In standard PoE, PSE will communicate with PD to negotiate its wattage requirements. Besides, 802.3at PSE is backward-compatible with 802.3af PD.

 

So an 802.3af PD can be powered by either 802.3af or 802.3at PSE, while an 802.3at PD can only be powered by an 802.3at PSE.

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#15
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Re:EAP Changed IP address, Log Entry
2020-09-15 17:57:28

@Bobby1859 

I received the following via a message from Fae in the TP-Link Community:

“Fae replied your subscription EAP Changed IP address, Log Entry. 

 

The EAP245 V3 supports both 802.3af and 802.3at, while EAP245 V1 only supports 802.3at.

 

My response:

All of our EAP245's are V3. If V3 supports 802.3af what could be causing the log messages per my forum posts?

Thanks,

 

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#16
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Re:EAP Changed IP address, Log Entry
2020-09-15 18:00:32

@Bobby1859 

An additional question:

Why do the log events stop when I change the EAP 245 V3 power source from a TP-Link 5 port Gb PoE af switch to the power injector?  

 

Thanks,

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#17
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Re:EAP Changed IP address, Log Entry
2020-09-25 02:47:59

Dear @Bobby1859,

 

Sorry I didn't notice that my previous reply was deleted, now it's restored.

 

For your case, may I check the cable you are using to connect between the EAP and PoE switch? CAT5 or CAT6? What's the length? Are you using the originally provided power adapter to power up the PoE Switch? When you use the PoE switch to power up the EAP245, would the Ethernet LED turn off within 40s-60s on the PoE switch? Did you notice any network drop with EAP245?

>> Omada EAP Firmware Trial Available Here << *Try filtering posts on each forum by Label of [Early Access]*
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#18
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Re:EAP Changed IP address, Log Entry
2020-09-25 13:01:38

 

Fae wrote

Dear @Bobby1859,

 

Sorry I didn't notice that my previous reply was deleted, now it's restored.

 

For your case, may I check the cable you are using to connect between the EAP and PoE switch? CAT5 or CAT6? What's the length? Are you using the originally provided power adapter to power up the PoE Switch? When you use the PoE switch to power up the EAP245, would the Ethernet LED turn off within 40s-60s on the PoE switch? Did you notice any network drop with EAP245?

___________

@Fae The cable is CAT7, it's 100 feet long.  The power injector is the one included with the EAP245.  The POE switch is a TP-Link TL-SG1005P.

I didn't notice any network drops.  When I used the PoE switch to power the EAP245, I did not notice if the Ethernet LED turned off within 40s-60s on the PoE switch.  I can set up a test to try to answer this question.  I will let you know the answer.

 

Thanks

 

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#19
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