poe+

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HELLO, I ́M HAVING A PROBLEM WITH X460 SWITCH RUNNING XOS 15.6.3.1, THINK IT IS NOT GIVING ME THE RIGHT POE, I ́M USING ONE PORT TO CONNECT A 3COM SWITCH (3CNJ2000) THAT HAVE TWO POE PORTS AND IN BOTH PORTS I ́M OBTAINING DATA BUT NO POWER TO FEED TWO AVAYA PHONES. HOW CAN I KNOW EXTREME IS GIVING ME THE CORRECT POWER TO FEED THE 3COM SWITCH? I HAVE TRIED SEVERAL INLINE-POWER CONFIGURATIONS WITH NO SUCCESS.
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juan romero

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Posted 2 years ago

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David Coglianese, Embassador

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You're powering the 3com switch with poe?
Show inline-power info port #:##

What's it delivering ?
What does the switch need?
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juan romero

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I ́m powering the 3com switch with the poe of the extreme port.

this the result of the command:

Port  State           Class      Volts   Curr    Power     Fault
                                         (mA)   (Watts)
3:18  delivering      class4     56.0     78      4.300    None

I think that the extreme port is not giving the power that 3com needs in order to deliver enough power to feed a poe device.


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Pala, Zdenek, Employee

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If you connect your avaya phone directly to X460. Will it work?

Does your 3com support delivering PoE when powered over PoE?
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juan romero

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Yes, the telephone Works properly when directly connected.

Yes it supports delivering Poe when powered with PoE, I did a test with a cisco switch

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Karthik Mohandoss, Employee

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Curtis Parish

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Read the notes carefully about poe on the 3com. It was early Poe plus so it may not be asking the extreme switch for full POE. The 3com uses about half the power for itself so it is doubtful it is passing enough power for 2 phones.
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juan romero

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THE 3COM SWITCH WORKS PROPERLY WITH CISCO, DO YOU THINK THE PROBLEM IS ONLY WITH EXTREME SWITCHS?

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Karthik Mohandoss, Employee

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Hi Juan,

Did you got a chance to configure the "power-via-mdi with-classification" as mentioned in the article and test?
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juan romero

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Yes, I did it but did not work.
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Henrique, Employee

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Hi Juan, please provide the output for show inline-power info detail port 3:18
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juan romero

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This is the output for that port.

Port 3:18

Configured Admin State: enabled
Inline Power State    : delivering
MIB Detect Status     : delivering
Label                 :
Operator Limit        : 30000 milliwatts
PD Class              : class4
Max Allowed Power     : 30.0 W
Measured Power        : 4.200 W
Line Voltage          : 56.0 Volts
Current               : 76 mA
Fault Status          : None
Detailed Status       : Delivering power to IEEE PD
Priority              : high
Detection             : 802.3af-only

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David Coglianese, Embassador

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I am curious if it will work if you put detection into bypass mode.

What code version are you running?
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Henrique, Employee

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According to 3CNJ2000 documentation: 

If power is supplied to the uplink port by 802.3at or by the external power supply, then ports 1 and 2 may act as PoE PSE (Power Source Equipment) and may also provide power to other devices plugged into those ports. 

If power is supplied by 802.3af, then port 1 and 2 will not be able to supply PoE power.

Based on the outputs they were negotiated using 802.3af.
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David Coglianese, Embassador

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15.6 he could try legacy power, that is pretty close to bypass in behavior.
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Henrique, Employee

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True, this will use another measurement method (capacitance instead of resistance) and might help:

enable inline-power legacy

Note: Make sure to connect only PoE devices in that port (3:18) when using this command
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juan romero

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POE led is amber but, is there any way to force extreme to deliver 802.3at in that port? according to the documentation x460 supports both 802.3at and 802.3af.

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Henrique, Employee

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Hi Juan, did you try the command "enable inline-power legacy"?

Another option would be trying to provide power based on LLDP MED as already mentioned before:

"configure lldp ports 3:18 advertise vendor-specific med capabilities"

"configure lldp ports 3:18 advertise vendor-specific dot3 power-via-mdi with-classification"

I don't see any command to force PoE+ in a port or even a minimum power.
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juan romero

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Yes I tried with lldp and with legacy but still not working
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Drew C., Community Manager

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Hi Juan, if you're still having trouble with this, I'd recommend that you open a case with GTAC.
How to contact Extreme Networks Global Technical Assistance Center (GTAC)