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Problems with inline power on Cat4510E

Hi, all.

I have noticed a kind of strange behaviour on some of our Cat4510E access switches regarding inline power,

here is a short description of the situation:

All switches have 4200 Watts redundant power supplies, normally running in "redundant mode", most of the modules

are WS-X4648-RJ45V+E, when the 4510 is fully equipped, the last 3 modules are WS-X4548-RJ45V+.

We have a IP telephony solution (Siemens) implemented, the phones are powered with inline power.

Normally a fully equipped 4510 has about 35-60 telephones connected (some have more, some less, but the effect

is the same on all switches), I have noticed that when an additional PoE device is connected it gets "power-deny"

from the switch, even if the available power should be more than sufficiant for additional devices .....

The only solution to get this additional device working over PoE is to switch to "power redundancy-mode combined" .....

Here are some show-commands to show you, as you can see, the switch is running in combined-mode now:


sh power avail
Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)       1100        2200
Inline Power (-50V)      3076        6200
Backplane Power (3.3V)     40          40
----------------------   ----     ---------
Total                    4216 (not to exceed Total Maximum Available = 7600)

Power Measurement    Inline Power (-50V)
(in Watts)             (+/- 50Watts)
------------------   -------------------
PS1                         100
PS2                         100
------------------   -------------------
Total                       200

This tells me, that 3076 Watts are used by PoE devices at this moment, but when I count the devices, I

get a totally different output:

sh power inline | incl on


Interface Admin  Oper            Power(Watts)     Device              Class
                            From PS    To Device
--------- ------ ---------- ---------- ---------- ------------------- ----- 

Gi1/17    auto   on         16.6       15.4       Ieee PD             3
Gi1/23    auto   on         16.6       15.4       Ieee PD             3
Gi1/25    auto   on         16.6       15.4       Ieee PD             3
Gi1/29    auto   on         9.8        9.1        Ieee PD             3
Gi1/31    auto   on         16.6       15.4       Ieee PD             3
Gi1/35    auto   on         16.6       15.4       Ieee PD             3
Gi2/7     auto   on         16.6       15.4       Ieee PD             3
Gi2/17    auto   on         8.1        7.5        Ieee PD             3
Gi2/45    auto   on         16.6       15.4       Ieee PD             3
Gi3/3     auto   on         16.6       15.4       Ieee PD             3
Gi3/10    auto   on         16.6       15.4       Ieee PD             3
Gi3/11    auto   on         16.6       15.4       Ieee PD             3
Gi3/17    auto   on         8.1        7.5        Ieee PD             3
Gi3/21    auto   on         16.6       15.4       Ieee PD             3
Gi3/26    auto   on         16.6       15.4       Ieee PD             3
Gi3/27    auto   on         16.6       15.4       Ieee PD             3
Gi3/30    auto   on         16.6       15.4       Ieee PD             3
Gi3/31    auto   on         16.6       15.4       Ieee PD             3
Gi3/33    auto   on         16.6       15.4       Ieee PD             3
Gi3/35    auto   on         16.6       15.4       Ieee PD             3
Gi3/38    auto   on         16.6       15.4       Ieee PD             3
Gi3/41    auto   on         16.6       15.4       Ieee PD             3
Gi3/43    auto   on         16.6       15.4       Ieee PD             3
Gi3/45    auto   on         16.6       15.4       Ieee PD             3
Gi4/9     auto   on         16.6       15.4       Ieee PD             3
Gi4/20    auto   on         8.9        8.3        Ieee PD             3
Gi4/32    auto   on         8.1        7.5        Ieee PD             3
Gi4/34    auto   on         8.1        7.5        Ieee PD             3
Gi4/41    auto   on         8.9        8.3        Ieee PD             3
Gi7/2     auto   on         8.1        7.5        Ieee PD             3
Gi7/4     auto   on         8.1        7.5        Ieee PD             3
Gi7/8     auto   on         8.1        7.5        Ieee PD             3
Gi7/10    auto   on         8.1        7.5        Ieee PD             3
Gi7/12    auto   on         16.6       15.4       Ieee PD             3
Gi7/21    auto   on         16.6       15.4       AIR-LAP1142N-E-K9   3
Gi7/23    auto   on         16.6       15.4       AIR-LAP1142N-E-K9   3
Gi8/2     auto   on         16.4       15.4       Ieee PD             3

Totals:          37   on    522.5      486.1  

This tells me that 37 devices consume 522 Watts from the power supplies via inline power ......

What is the deal with that ??? Any ideas which number is true ???

Seems like the 3076 Watts are true, because as I told before, no additional device

gets inline power, all additional devices get "power-deny".

Could this be a crazy bug in the IOS image ??

sh ver
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M), Version 12.2(54)SG, RELEASE SOFTWARE (fc3)

sh power detail
Power                                             Fan      Inline
Supply  Model No          Type       Status       Sensor   Status
------  ----------------  ---------  -----------  -------  -------
PS1     PWR-C45-4200ACV   AC 4200W   good         good     good
PS1-1                         220V   good
PS1-2                         220V   good
PS2     PWR-C45-4200ACV   AC 4200W   good         good     good
PS2-1                         220V   good
PS2-2                         220V   good

Power supplies needed by system    : 2
Power supplies currently available : 2

Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)       1100        2200
Inline Power (-50V)      3076        6200
Backplane Power (3.3V)     40          40
----------------------   ----     ---------
Total                    4216 (not to exceed Total Maximum Available = 7600)

Power Measurement    Inline Power (-50V)
(in Watts)             (+/- 50Watts)
------------------   -------------------
PS1                         100
PS2                         100
------------------   -------------------
Total                       200

                             Watts Used of System Power(12V)
Mod   Model                 budgeted instantaneous  peak   out of reset  in reset
----  -------------------   -------- ------------- ------  ------------  --------
1    WS-X4648-RJ45V+E          92         --        --         92          10
2    WS-X4648-RJ45V+E          92         --        --         92          10
3    WS-X4648-RJ45V+E          92         --        --         92          10
4    WS-X4648-RJ45V+E          92         --        --         92          10
5    WS-X45-SUP6-E            260         --        --        260         260
7    WS-X4648-RJ45V+E          92         --        --         92          10
8    WS-X4548-RJ45V+           60         --        --         60          25
9    WS-X4548-RJ45V+           60         --        --         60          25
10    WS-X4548-RJ45V+           60         --        --         60          25
--   Fan Tray                 200         --        --        --          --
-------------------------   -------- ------------- ------  ------------  --------
       Total                  1100         --        --        900         385

                        Watts used of Chassis Inline Power (-50V)
                        Inline Power Admin  Inline Power Oper
Mod   Model                PS     Device       PS     Device     Efficiency
----  -------------------  ----------------    ----------------    ----------
1    WS-X4648-RJ45V+E        93       86         23       22          93
2    WS-X4648-RJ45V+E        41       38         12       11          93
3    WS-X4648-RJ45V+E       240      223         61       57          93
4    WS-X4648-RJ45V+E        51       47         22       20          93
5    WS-X45-SUP6-E            -        -          -        -           -
7    WS-X4648-RJ45V+E        82       76         48       45          93
8    WS-X4548-RJ45V+         16       15         11       10          94
9    WS-X4548-RJ45V+          0        0         17       16          94
10    WS-X4548-RJ45V+          0        0         11       10          94
-------------------------  ----------------    ----------------    ----------
       Total                 523      485        205      191

Any help or hints would be appreciated ....

Regards

Frank

5 REPLIES 5
Shashank Singh
Cisco Employee

Hi Frank,

Yes this looks like an accounting error when it comes to calculating the inline power utilization. Symptoms match the bug CSCsj47170 but this seems to have been fixed in the IOS you are running.

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsj47170

The "Inline Power Admin" column displays the amount of PoE allocated by the powered devices attached to the module. This value should match the value against Inline Power (-50V)  in power summary table.

In our case, sum of the value in "sh power inline | incl on"  = total Inline Power Admin = 523 W (which seems reasonable for 37 devices). However I am not sure if 3076W is being incorrectly displayed in the summary or that much power is actually being consumed somewhere.

I would suggest to open a TAC case and so that we can double check if the fix is present in the IOS version running on this switch.

Regards,

Shashank


Hi, all.

Funny thing happened since yesterday,

The output of "sh power avail" has changed:

sh power avail
Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)       1100        2200
Inline Power (-50V)      3411        6200
Backplane Power (3.3V)     40          40
----------------------   ----     ---------
Total                    4551 (not to exceed Total Maximum Available = 7600)  

"Inline Power Used" has been increased by 350 Watts, but the total PoE device count hasn't changed:

sh power inline | incl on
Gi1/17    auto   on         16.6       15.4       Ieee PD             3
Gi1/23    auto   on         16.6       15.4       Ieee PD             3
Gi1/25    auto   on         16.6       15.4       Ieee PD             3
Gi1/29    auto   on         9.8        9.1        Ieee PD             3
Gi1/31    auto   on         16.6       15.4       Ieee PD             3
Gi1/35    auto   on         16.6       15.4       Ieee PD             3
Gi2/7     auto   on         16.6       15.4       Ieee PD             3
Gi2/17    auto   on         8.9        8.3        Ieee PD             3
Gi2/45    auto   on         16.6       15.4       Ieee PD             3
Gi3/3     auto   on         16.6       15.4       Ieee PD             3
Gi3/10    auto   on         16.6       15.4       Ieee PD             3
Gi3/11    auto   on         16.6       15.4       Ieee PD             3
Gi3/17    auto   on         8.1        7.5        Ieee PD             3
Gi3/21    auto   on         16.6       15.4       Ieee PD             3
Gi3/26    auto   on         16.6       15.4       Ieee PD             3
Gi3/27    auto   on         16.6       15.4       Ieee PD             3
Gi3/30    auto   on         16.6       15.4       Ieee PD             3
Gi3/31    auto   on         16.6       15.4       Ieee PD             3
Gi3/33    auto   on         16.6       15.4       Ieee PD             3
Gi3/35    auto   on         16.6       15.4       Ieee PD             3
Gi3/38    auto   on         16.6       15.4       Ieee PD             3
Gi3/41    auto   on         16.6       15.4       Ieee PD             3
Gi3/43    auto   on         16.6       15.4       Ieee PD             3
Gi3/45    auto   on         16.6       15.4       Ieee PD             3
Gi4/9     auto   on         16.6       15.4       Ieee PD             3
Gi4/20    auto   on         8.9        8.3        Ieee PD             3
Gi4/32    auto   on         8.9        8.3        Ieee PD             3
Gi4/34    auto   on         8.1        7.5        Ieee PD             3
Gi4/41    auto   on         8.9        8.3        Ieee PD             3
Gi7/2     auto   on         8.9        8.3        Ieee PD             3
Gi7/4     auto   on         8.1        7.5        Ieee PD             3
Gi7/8     auto   on         8.1        7.5        Ieee PD             3
Gi7/10    auto   on         8.9        8.3        Ieee PD             3
Gi7/12    auto   on         16.6       15.4       Ieee PD             3
Gi7/21    auto   on         16.6       15.4       AIR-LAP1142N-E-K9   3
Gi7/23    auto   on         16.6       15.4       AIR-LAP1142N-E-K9   3
Gi8/2     auto   on         16.4       15.4       Ieee PD             3
Totals:          37   on    526.0      489.3 

I will definetely contact TAC today with this issue and post the details here ....

Thx

Frank

Short update:

I even found another switch, where even the already combined power supplies are not enough anymore:

sh power avail
Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)       1040        1365
Inline Power (-50V)      6195        6200
Backplane Power (3.3V)     40          40
----------------------   ----     ---------
Total                    7275 (not to exceed Total Maximum Available = 7600)

sh power inline | incl on
Gi1/6     auto   on         16.6       15.4       Ieee PD             3
Gi1/9     auto   on         8.9        8.3        Ieee PD             3
Gi1/11    auto   on         9.8        9.1        Ieee PD             3
Gi1/16    auto   on         8.9        8.3        Ieee PD             3
Gi1/17    auto   on         16.6       15.4       Ieee PD             3
Gi1/19    auto   on         8.9        8.3        Ieee PD             3
Gi1/25    auto   on         8.9        8.3        Ieee PD             3
Gi1/28    auto   on         8.9        8.3        Ieee PD             3
Gi1/29    auto   on         16.6       15.4       Ieee PD             3
Gi1/38    auto   on         16.6       15.4       AIR-LAP1142N-E-K9   3
Gi2/11    auto   on         8.9        8.3        Ieee PD             3
Gi2/13    auto   on         8.9        8.3        Ieee PD             3
Gi2/17    auto   on         8.9        8.3        Ieee PD             3
Gi2/20    auto   on         8.9        8.3        Ieee PD             3
Gi2/21    auto   on         8.9        8.3        Ieee PD             3
Gi2/27    auto   on         8.9        8.3        Ieee PD             3
Gi2/29    auto   on         8.9        8.3        Ieee PD             3
Gi2/31    auto   on         8.1        7.5        Ieee PD             3
Gi2/35    auto   on         8.9        8.3        Ieee PD             3
Gi3/11    auto   on         16.6       15.4       Ieee PD             3
Gi3/17    auto   on         16.6       15.4       Ieee PD             3
Gi3/21    auto   on         16.6       15.4       Ieee PD             3
Gi3/23    auto   on         16.6       15.4       Ieee PD             3
Gi3/31    auto   on         16.6       15.4       Ieee PD             3
Gi3/35    auto   on         16.6       15.4       Ieee PD             3
Gi4/16    auto   on         9.8        9.1        Ieee PD             3
Gi4/18    auto   on         16.6       15.4       Ieee PD             3
Gi4/28    auto   on         16.6       15.4       Ieee PD             3
Gi4/38    auto   on         16.6       15.4       Ieee PD             3
Gi7/2     auto   on         16.6       15.4       AIR-LAP1142N-E-K9   3
Gi9/12    auto   on         16.4       15.4       Ieee PD             3
Gi9/14    auto   on         8.8        8.3        Ieee PD             3
Gi9/16    auto   on         8.8        8.3        Ieee PD             3
Gi9/17    auto   on         8.0        7.5        Ieee PD             3
Gi9/20    auto   on         8.0        7.5        Ieee PD             3
Gi9/32    auto   on         8.8        8.3        Ieee PD             3
Gi9/34    auto   on         8.0        7.5        Ieee PD             3
Gi9/41    auto   on         8.8        8.3        Ieee PD             3
Gi9/46    auto   on         16.4       15.4       Ieee PD             3
Totals:          39   on    467.5      435.7   

So, this is getting critical, because the only thing I can do now, is to reload

the box ......

This is def. a big fat bug .....

I opened a TAC case, but no news yet .......

Only a few questions:

- Did you change that ....did you do this ....

Seems like poking in the dark ....

Hi, all.

Cisco has now filed a new bug for this:

CSCtn92288

Link BugTool:

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtn92288

All current versions of the Cat 4500 12.2.(54)SG are affected by this bug.

Cisco set this one to "moderate", I would rather disagree to that, because PoE is not a "minor" feature in our network and the only workarounds to this I know is to reload the (production) box(es) .......

Lets see what happens next