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PoE change on IOS upgrade

I have a 3560-C switch (WS-C3560CPD-8PT-S) powered via auxiliary input. According to the specifications, it is able to provide 15.4 watts to PoE and PoE+ devices when connected this way. When running IOS 12.2.55-EX3, I am able to power a Cisco Meraki MR16 AP. However, when upgrading to IOS 15.0.2-SE5 or 15.2.1E2, the AP doesn't receive any power.

IOS 12.2.55-EX3:

%ILPOWER-7-DETECT: Interface Gi0/1: Power Device detected: IEEE PD
%ILPOWER-5-POWER_GRANTED: Interface Gi0/1: Power granted
%LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down
%LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to down
%LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up

Available:15.4(w)  Used:15.4(w)  Remaining:0.0(w)

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi0/1     auto   on         15.4    Ieee PD             4     30.0
Gi0/2     auto   off        0.0     n/a                 n/a   30.0
Gi0/3     auto   off        0.0     n/a                 n/a   30.0
Gi0/4     auto   off        0.0     n/a                 n/a   30.0
Gi0/5     auto   off        0.0     n/a                 n/a   30.0
Gi0/6     auto   off        0.0     n/a                 n/a   30.0
Gi0/7     auto   off        0.0     n/a                 n/a   30.0
Gi0/8     auto   off        0.0     n/a                 n/a   30.0

IOS 15.2.1E2

%ILPOWER-7-DETECT: Interface Gi0/1: Power Device detected: IEEE PD
%ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi0/1: inline power denied. Reason: Insufficient total available power

Available:15.4(w)  Used:0.0(w)  Remaining:15.4(w)

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi0/1     auto   power-deny 0.0     n/a                 n/a   30.0
Gi0/2     auto   off        0.0     n/a                 n/a   30.0
Gi0/3     auto   off        0.0     n/a                 n/a   30.0
Gi0/4     auto   off        0.0     n/a                 n/a   30.0
Gi0/5     auto   off        0.0     n/a                 n/a   30.0
Gi0/6     auto   off        0.0     n/a                 n/a   30.0
Gi0/7     auto   off        0.0     n/a                 n/a   30.0
Gi0/8     auto   off        0.0     n/a                 n/a   30.0

Any ideas as to why this would be happening?

  • LAN Switching and Routing
Everyone's tags (3)
1 REPLY
New Member

After some additional

After some additional troubleshooting, I enabled LLDP on the switch. After doing so, the AP scaled back the requested power to 10.5 watts.

Available:15.4(w)  Used:10.5(w)  Remaining:4.9(w)

Interface Admin  Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi0/1     auto   on         10.5    Ieee PD             4     30.0
Gi0/2     auto   off        0.0     n/a                 n/a   30.0
Gi0/3     auto   off        0.0     n/a                 n/a   30.0
Gi0/4     auto   off        0.0     n/a                 n/a   30.0
Gi0/5     auto   off        0.0     n/a                 n/a   30.0
Gi0/6     auto   off        0.0     n/a                 n/a   30.0
Gi0/7     auto   off        0.0     n/a                 n/a   30.0
Gi0/8     auto   off        0.0     n/a                 n/a   30.0.

However, later versions of IOS still do not provide power to the AP. Is this because later versions are sending less power down the line before the AP can send a LLDP frame?

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