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New Member

POE bug with catalyst 4500 switches and series 1130 aps?

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

4 REPLIES
Purple

Re: POE bug with catalyst 4500 switches and series 1130 aps?

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 ?

New Member

Re: POE bug with catalyst 4500 switches and series 1130 aps?

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.

Bronze

Re: POE bug with catalyst 4500 switches and series 1130 aps?

It looks like buggy code or something, as it says the power for the AP is 429495..

The figure 429495 is equal to 2*16, I believe. In other words, it looks like some counter has set itself to all binary one's instead of measuring the right value.

You might want to try a newer IOS for the switch to ensure fwer bugs.

HTH.

Silver

Re: POE bug with catalyst 4500 switches and series 1130 aps?

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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