07-23-2009 10:58 AM - edited 03-06-2019 06:55 AM
I have 2 cisco AIR-AP1131AG-A-K9 access points plugged into a WS-C4506. The Inline power readings seem a comically high for these devices:
10-2A-sw1#sh power inline gi2/40
Available:800(w) Used:666(w) Remaining:134(w)
Interface Admin Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----
Gi2/40 auto on 429495 42940. AIR-AP1131AG-A-K9 3
Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
---------- --------------- --------------------
Gi2/40 15.4 15.4
10-2A-sw1#sh power inline gi2/41
Available:800(w) Used:666(w) Remaining:134(w)
Interface Admin Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----
Gi2/41 auto on 429495 42940. Ieee PD 3
Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
---------- --------------- --------------------
Gi2/41 15.4 15.4
This also appears to be service affecting, we cannot add any new poe devices to this switch without first re-setting these APs. But soon after the AP restarts (within ~1 min), the inline power numbers rise to what's posted above. Users are still able to connect to our wireless network through these APs. Is this a bug with our IOS version or something else?
More, relevant information:
10-2A-sw1#sh ver
Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EWA10, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 11-Jul-07 00:08 by dchih
Image text-base: 0x10000000, data-base: 0x114BC038
ROM: 12.2(20r)EW1
Dagobah Revision 226, Swamp Revision 34
10-2A-sw1 uptime is 24 weeks, 5 days, 21 hours, 56 minutes
System returned to ROM by power-on
System image file is "bootflash:"
cisco WS-C4506 (MPC8245) processor (revision 10) with 262144K bytes of memory.
Processor board ID FOX07041HR4
MPC8245 CPU at 266Mhz, Supervisor II+
Last reset from PowerUp
2 Virtual Ethernet interfaces
98 Gigabit Ethernet interfaces
511K bytes of non-volatile configuration memory.
Configuration register is 0x2101
10-2A-sw1#sh mod
Chassis Type : WS-C4506
Power consumed by backplane : 0 Watts
Mod Ports Card Type Model Serial No.
---+-----+--------------------------------------+------------------+-----------
1 2 Supervisor II+ 1000BaseX (GBIC) WS-X4013+ JAE1130S21C
2 48 10/100/1000BaseT (RJ45)V, Cisco/IEEE WS-X4548-GB-RJ45V JAE1132TM62
3 48 10/100/1000BaseT (RJ45)V, Cisco/IEEE WS-X4548-GB-RJ45V JAE1133U3X5
M MAC addresses Hw Fw Sw Status
--+--------------------------------+---+------------+----------------+---------
1 000c.3098.dbc0 to 000c.3098.dbc1 4.3 12.2(20r)EW1 12.2(25)EWA10 Ok
2 001d.4505.2510 to 001d.4505.253f 3.3 Ok
3 001c.58a6.55c0 to 001c.58a6.55ef 3.3 Ok
07-23-2009 04:31 PM
It's telling you its drawing 15.4 watts , thats normal . The other number is the total power available for powering devices . you should still have 134 watts available to draw. I have never seen a POE issue with any AP drawing too much power , may be something else going on . Are the power supplies too small for what you are trying to do ?
07-23-2009 07:40 PM
The chassis has 2x 1300watts power supplies, as recommended by the power calc. I realize the system says there is available power, but when connecting additional VoIP phones the switch logs the message:
24w5d: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi2/17: inline power denied
Power is not granted to the additional VoIP phone until I cycle the above APs. The only hint as to a possible cause is the erroneous wattage numbers recorded:
10-2A-sw1#sh power inline module 2
Available:800(w) Used:680(w) Remaining:120(w)
Interface Admin Oper Power(Watts) Device Class
From PS To Device
--------- ------ ---------- ---------- ---------- ------------------- -----
Gi2/1 auto on 7.9 7.0 Ieee PD 2
Gi2/2 auto on 17.3 15.4 Ieee PD 3
Gi2/3 auto off 0.0 0.0 n/a n/a
Gi2/4 auto on 17.3 15.4 Ieee PD 3
Gi2/5 auto on 17.3 15.4 Ieee PD 3
...
...
Gi2/38 auto on 17.3 15.4 Ieee PD 3
Gi2/39 auto off 0.0 0.0 n/a n/a
Gi2/40 auto on 429495 42940. AIR-AP1131AG-A-K9 3
Gi2/41 auto on 429495 42940. Ieee PD 3
Gi2/42 auto off 0.0 0.0 n/a n/a
Gi2/43 auto off 0.0 0.0 n/a n/a
Gi2/44 auto off 0.0 0.0 n/a n/a
Gi2/45 auto off 0.0 0.0 n/a n/a
Gi2/46 auto off 0.0 0.0 n/a n/a
Gi2/47 auto on 17.3 15.4 Ieee PD 3
Gi2/48 auto off 0.0 0.0 n/a n/a
--------- ------ ---------- ---------- ---------- ------------------- -----
Totals: 21 on 280.2 86148.
07-24-2009 04:49 AM
It looks like buggy code or something, as it says the power for the AP is 429495.
The figure 429495
You might want to try a newer IOS for the switch to ensure fwer bugs.
HTH.
07-27-2009 12:19 PM
The bug is
CSCsk11184
IEEE POE devices incorrectly allocated too much power
Duplicate-of CSCsj47170
12.2(25)EWA10 : show power inline command not showing the proper power
Fixed in 12.2(25)EWA12
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