Hi I have WS-C3750X-48P some ports POE not working giving power-deny

[Osama ibnouf]

Hi, I have WS-C3750X-48P some ports POE not working giving power-deny

I disabled  power inline from 25-36

Then I enabled from 37-48

power inline auto

power inline port priority high

power inline port 2x-mode

then I did shutdown, no shutdown But still the same 

Interface Admin Oper Power Device Class Max

Gi1/0/25 off      off 0.0 n/a n/a 30.0
Gi1/0/26 off      off 0.0 n/a n/a 30.0
Gi1/0/27 off      off 0.0 n/a n/a 30.0
Gi1/0/28 off      off 0.0 n/a n/a 30.0
Gi1/0/29 off     off 0.0 n/a n/a 30.0
Gi1/0/30 off     off 0.0 n/a n/a 30.0
Gi1/0/31 off     off 0.0 n/a n/a 30.0
Gi1/0/32 off     off 0.0 n/a n/a 30.0
Gi1/0/33 off     off 0.0 n/a n/a 30.0
Gi1/0/34 off     off 0.0 n/a n/a 30.0
Gi1/0/35 off     off 0.0 n/a n/a 30.0
Gi1/0/36 off     off 0.0 n/a n/a 30.0
Gi1/0/37 auto     off 0.0 n/a n/a 30.0
Gi1/0/38 auto     on 6.3 IP Phone 7942 2 30.0
Gi1/0/39 auto     off 0.0 n/a n/a 30.0
Gi1/0/40 auto     on 6.3 IP Phone 7942 2 30.0
Gi1/0/41 auto     off 0.0 n/a n/a 30.0
Gi1/0/42 auto     off 0.0 n/a n/a 30.0
Gi1/0/43 auto     off 0.0 n/a n/a 30.0
Gi1/0/44 auto     on 6.3 IP Phone 8811 2 30.0
Gi1/0/45 auto     off 0.0 n/a n/a 30.0
Gi1/0/46 auto     on 3.7 IP Phone 7841 1 30.0
Gi1/0/47 auto     power-deny 0.0 n/a n/a 30.0
Gi1/0/48 auto     power-deny 0.0 n/a n/a 30.0

[balaji.bandi]

what device that  has been connected to the port and denied, do you have LLDP enabled (if 3rd party device) ?

Can you post the below output :

show verison

#show modules

#show power inline (full output)

#show run  interface GigabitEthernet1/0/47

#show run interface GigabitEthernet1/0/48

last option reload the switch and see if that fix the issue

some troubleshooting tips :

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/g_power_over_ethernet.html

[Leo Laohoo]

Power deny probably because those ports have triggered a loopback alarm.  

Could be a faulty cable. 

Please post the complete output to the command "sh post".

[Osama ibnouf]

#show post
Stored system POST messages:

Switch 1
---------

POST: CPU MIC register Tests : Begin
POST: CPU MIC register Tests : End, Status Passed

POST: MA BIST : Begin
POST: MA BIST : End, Status Passed

POST: TCAM BIST : Begin
POST: TCAM BIST : End, Status Passed

POST: SF ASIC BIST : Begin
POST: SF ASIC BIST : End, Status Passed

POST: Switch Fabric Memory Tests : Begin
POST: Switch Fabric Memory Tests : End, Status Passed

POST: CPU MIC interface Loopback Tests : Begin
POST: CPU MIC interface Loopback Tests : End, Status Passed

POST: PortASIC RingLoopback Tests : Begin
POST: PortASIC RingLoopback Tests : End, Status Passed

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed

POST: Thermal, Fan Tests : Begin
POST: Thermal, Fan Tests : End, Status Passed

POST: PortASIC Port Loopback Tests : Begin
POST: PortASIC Port Loopback Tests : End, Status Passed

POST: PortASIC Macsec Loopback Tests : Begin
POST: PortASIC Macsec Loopback Tests : End, Status Passed

POST: EMAC Loopback Tests : Begin
POST: EMAC Loopback Tests : End, Status Passed

__________________________________________

Could be a faulty cable. / Cable changes but still same issue

[Leo Laohoo]

---

@Osama ibnouf wrote:

Cable changes but still same issue

---

1.  After the cable was replaced, what do the logs say? 

2.  Do the following: 

• Command:  cable tdr interface Gi 1/0/24
• Wait for approximately 5 to 7 seconds
• Command:  show cable tdr interface Gi 1/0/24
• Post the output to to the show command.