Solved: 2960-S POE switch not supplying enough power for 1252 WAP(s)

Graeme Shea · ‎06-13-2011

HI all,

I have been unable to use POE from my 2960-s switches to power my Cisco 1252 WAPs.

"Show power inline" reports the power as15.4 Watts, "Ieee PD" Device and Class "3". 1252s need about 20 Watts and the command shows 30 Watts Max is available. Setting the power to static 30 Watts seems to make no difference.

Show version on the switch returns (with serial numbers removed):

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 04:C5:A4:D0:4A:80
Motherboard assembly number     : 73-11908-06
Power supply part number        : 341-0393-02

Model revision number           : C0
Motherboard revision number     : A0
Model number                    : WS-C2960S-24PS-L
Daughterboard assembly number   : 73-11933-04

Top Assembly Part Number        : 800-30945-02
Top Assembly Revision Number    : B0
Version ID                      : V02
CLEI Code Number                : COMGE00ARB
Daughterboard revision number   : A0
Hardware Board Revision Number : 0x01

Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    1 28    WS-C2960S-24PS-L   12.2(55)SE3           C2960S-UNIVERSALK9-M

Without good reason I am assuming this is a switch problem but incase the details (with serial numbers removed) of the WAP(s) are

System image file is "flash:/c1250-k9w7-mx.124-10b.JDA3/c1250-k9w7-mx.124-10b.JDA3"

cisco AIR-AP1252AG-N-K9 (PowerPC 8349) processor (revision C0) with 49142K/16384K bytes of memory.
Processor board ID FCW1347Z38U
PowerPC 8349 CPU at 533Mhz, revision number 0x0031
Last reset from power-on
1 Gigabit Ethernet interface
2 802.11 Radio(s)

32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: C4:7D:4F:E0:CB:9E
Part Number                          : 73-10425-06
PCA Assembly Number                  : 800-27630-06
PCA Revision Number                  : B0

Top Assembly Part Number : 800-29039-03

Top Revision Number : A0
Product/Model Number : AIR-AP1252AG-N-K9

Configuration register is 0xF

Any help in getting this working would be much appreciated. I have the same setup working at two other sites just not this one.

Many thanks in advance

Graeme

Leo Laohoo · ‎06-13-2011

CDP is enabled on the switch but not on the WAP. The command "show CDP" on the WAP returns "% CDP is not enabled".

That's probably it. Get the owner of the AP to enable CDP and let us know.

View solution in original post

Leo Laohoo · ‎06-13-2011

Please post the the output for "sh power inline" and the configuration of the port in question.

Graeme Shea · ‎06-13-2011

Thankyou for the reply.Power inline returns

Module Available Used Remaining

(Watts) (Watts) (Watts)

------ --------- -------- ---------

1 370.0 45.4 324.6

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Gi1/0/1 auto off 0.0 n/a n/a 30.0

Gi1/0/2 auto off 0.0 n/a n/a 30.0

Gi1/0/3 static off 30.0 n/a n/a 30.0

Gi1/0/4 auto off 0.0 n/a n/a 30.0

Gi1/0/5 auto off 0.0 n/a n/a 30.0

Gi1/0/6 auto off 0.0 n/a n/a 30.0

Gi1/0/7 auto on 15.4 Ieee PD 3 30.0

Gi1/0/8 auto off 0.0 n/a n/a 30.0

Gi1/0/9 auto off 0.0 n/a n/a 30.0

Gi1/0/10 auto off 0.0 n/a n/a 30.0

Gi1/0/11 auto off 0.0 n/a n/a 30.0

Gi1/0/12 auto off 0.0 n/a n/a 30.0

Gi1/0/13 auto off 0.0 n/a n/a 30.0

Gi1/0/14 auto off 0.0 n/a n/a 30.0

Gi1/0/15 auto off 0.0 n/a n/a 30.0

Gi1/0/16 auto off 0.0 n/a n/a 30.0

Gi1/0/17 auto off 0.0 n/a n/a 30.0

Gi1/0/18 auto off 0.0 n/a n/a 30.0

Gi1/0/19 auto off 0.0 n/a n/a 30.0

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Gi1/0/20 auto off 0.0 n/a n/a 30.0

Gi1/0/21 auto off 0.0 n/a n/a 30.0

Gi1/0/22 auto off 0.0 n/a n/a 30.0

Gi1/0/23 auto off 0.0 n/a n/a 30.0

Gi1/0/24 auto off 0.0 n/a n/a 30.0

The device is plugged into port 7 and port 3 is where I tried setting the static power.

Show config Gi1/0/7 returns:

!

interface GigabitEthernet1/0/7

description Edge Switch port for clients

switchport mode access

spanning-tree portfast

Hope this is what was wanted.

Regards

Graeme

Leo Laohoo · ‎06-13-2011

Gi1/0/7   auto   on         15.4    Ieee   PD             3     30.0

Is the "Ieee" all the time? If your answer is YES then I'm suspecting that you have a faulty cable.

Can you then do a TDR test. Here is the process:

1. Command "test cable tdr int g 1/0/7";

2. Wait for about 6 seconds;

3. Command "sh cable tdr int g 1/0/7"

Please post the output.

Graeme Shea · ‎06-13-2011

Thanks again. Yes the port the wap is plugged into always shows Ieee. The wap is sitting on top of the switch, both on the bench beside me. The wap is plugged into the switch with a brand new 1M cat 5e patch lead. the test result shows

4762_2960_02#test cable tdr int g 1/0/7
TDR test started on interface Gi1/0/7
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
4762_2960_02#
*Mar 1 12:21:45.095 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
*Mar 1 12:21:46.091 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/7, changed state to down
*Mar 1 12:21:47.092 EDT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/7, changed state to down
*Mar 1 12:21:48.267 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up
*Mar 1 12:21:50.259 EDT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/7, changed state to up
*Mar 1 12:21:51.260 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/7, changed state to up
4762_2960_02#sh cable tdr int g 1/0/7
TDR test last run on: March 01 12:21:42

Interface Speed Local pair Pair length        Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/7   1000M Pair A     0    +/- 0 meters Pair A      Normal
                Pair B     1    +/- 0 meters Pair B      Normal
                Pair C     1    +/- 0 meters Pair C      Normal
                Pair D     0    +/- 0 meters Pair D      Normal
4762_2960_02#

I replaced the lead with a brand new cat 6 lead and got:

4762_2960_02#test cable tdr int g 1/0/7
TDR test started on interface Gi1/0/7
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.
4762_2960_02#
*Mar 1 12:27:49.224 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
*Mar 1 12:27:50.215 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/7, changed state to down
*Mar 1 12:27:51.222 EDT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/7, changed state to down
*Mar 1 12:27:52.019 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up
*Mar 1 12:27:54.011 EDT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/7, changed state to up
*Mar 1 12:27:55.012 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/7, changed state to upsh cable tdr int g 1/0/7
TDR test last run on: March 01 12:27:46

Interface Speed Local pair Pair length        Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/7   1000M Pair A     0    +/- 0 meters Pair A      Normal
                Pair B     0    +/- 0 meters Pair B      Normal
                Pair C     0    +/- 0 meters Pair C      Normal
                Pair D     1    +/- 0 meters Pair D      Normal
4762_2960_02#

Regards

Graeme

Leo Laohoo · ‎06-13-2011

Ok. That's a bizzare situation. I have a significant amount of 1250's and alot are connected to 1250 (more than one per switch) and the only time I've seen the "Ieee" staying there all the time was when I have a faulty cable.

This may or may not fix the issue but can you enter the interface-level command "power inline consumption 20000"?

Graeme Shea · ‎06-13-2011

Thanks again. I did a config t, int gi1/0/7, power inline consumption 2000 which succeded ok. I then backed out and did a show power inline and got:

4762_2960_02#show power inline

Module   Available     Used     Remaining
          (Watts)     (Watts)    (Watts)
------   ---------   --------   ---------
1           370.0       50.0       320.0
Interface Admin Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/2   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/3   static off        30.0    n/a                 n/a   30.0
Gi1/0/4   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/5   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/6   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/7   auto   on         20.0    Ieee PD             3     30.0
Gi1/0/8   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/9   auto   off        0.0     n/a                 n/a   30.0
Gi1/0/10 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/11 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/12 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/13 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/14 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/15 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/16 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/17 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/18 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/19 auto   off        0.0     n/a                 n/a   30.0
Interface Admin Oper       Power   Device              Class Max
                            (Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/20 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/21 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/22 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/23 auto   off        0.0     n/a                 n/a   30.0
Gi1/0/24 auto   off        0.0     n/a                 n/a   30.0
4762_2960_02#

The wap is still not working and showing a flashing red LED indicating it is running in low power mode.

Regards

Graeme

Leo Laohoo · ‎06-13-2011

System image file is "flash:/c1250-k9w7-mx.124-10b.JDA3/c1250-k9w7-mx.124-10b.JDA3

Try upgrading the IOS.

Graeme Shea · ‎06-13-2011

Its going to take quite a while to get through all the internal channels to convince the holders of the support contract number I need to update the WAP IOS.

I have this IOS operating successfully at 2 other sites where the WAPS have been converted to run in lighweight mode. With this in mind and from the help you have given me I'm beginning to think this is a wap configuration issue rather than a switch one.

Regards

Graeme

Leo Laohoo · ‎06-13-2011

I have never seen a WAP configuration that could cause this. Is CDP enabled on the port and AP?

Graeme Shea · ‎06-13-2011

CDP is enabled on the switch but not on the WAP. The command "show CDP" on the WAP returns "% CDP is not enabled". I have limited access to these WAPs so I dont think I can enable it easily.

Regards

Graeme

Leo Laohoo · ‎06-13-2011

CDP is enabled on the switch but not on the WAP. The command "show CDP" on the WAP returns "% CDP is not enabled".

That's probably it. Get the owner of the AP to enable CDP and let us know.

Graeme Shea · ‎06-13-2011

Great, I had enough access to enable CDP on the WAP Ethernet interface and everything seems ok. Show power inline is reporting auto power setting and 20W.

Many thanks Ieolaohoo

Graeme

Leo Laohoo · ‎06-13-2011

Beauty! Can you take out the command "power inline consumption 20000"? Hoping to get the switch negotiate properly.

Thanks for the ratings.

Graeme Shea · ‎06-13-2011

Done and the rating (marked correct answer) is well deserved.

Many thanks again.

Graeme