IP Phone POE

[RakiRaki17746]

Dear all 

let me explain the Network environment .. i have 2960x 48 port series  which is  POE  have connected Cisco phone CP-3905 which is powerd by POE and from phone i have connected to the end device like Laptop or desktop 

Issue : phones are getting off even though they are connected to the switch every time i have to login to my switch and have to shutdown and  un shut the port to make the phone Up ... 

switch port config info : interface GigabitEthernet1/0/2
description 802.1x Configured
switchport access vlan 51
switchport mode access
switchport voice vlan 18
authentication port-control auto
dot1x pae authenticator

Need help ..Thank you

[Mark Malone]

Hi
Is it 802.1x thats causing it ? if you remove that is it still happening last 2 command
have you any logs from the switch when it happens ?

[RakiRaki17746]

I think there is nothing to do with 802.1x ..  but still its mandatory for our organization that all the ports should in 802.1x configured so i can't remove that part any other way ?/ 

and thank you for  helping 

[Georg Pauwen]

Hello,

in addition to Mark's suggestions, I have looked around, and there could be a problem with the 3905 phones and LLDP. On the ports connected to the 3905 phones, try and disable LLDP (no lldp transmit), and use CDP instead (which should be enabled by default)...

[RakiRaki17746]

Thanks for input

Will this need any reload of switch or restart required .. My network should not go down coz we work in citrix 

[Mark Malone]

no its just config no restarts required , any logs from the switches so we can see what might be causing it ?

[RakiRaki17746]

Ok then i ll remove LLDP ..

And will monitor. 

Also one more question 

Some times even phone wont get enough power to turn on in this case i have to use POE injuctors to power up the phone any suggession on this??

Thank you 

[Mark Malone]

Also one more question

Some times even phone wont get enough power to turn on in this case i have to use POE injuctors to power up the phone any suggession on this??

Check show power inline . to see if you have any POE left , you maybe over drawing the power supplies to what you actually have connected , what power supplies and what model switch is it and what phones exactly are being connected , these are things to check

[RakiRaki17746]

Hear is the log 

CPO-GREEN-CENTER-SW-1#sh power inline

Module Available Used Remaining
(Watts) (Watts) (Watts)
------ --------- -------- ---------
1 740.0 230.4 509.6
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/1 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/2 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/3 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/4 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/5 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/6 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/7 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/8 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/9 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/10 auto on 3.5 IP Phone 3905 1 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 on 3.5 IP Phone 3905 1 30.0
Gi1/0/14 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/15 auto on 3.5 IP Phone 3905 1 30.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/16 auto off 0.0 n/a n/a 30.0
Gi1/0/17 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/18 auto off 0.0 n/a n/a 30.0
Gi1/0/19 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/20 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/21 auto off 0.0 n/a n/a 30.0
Gi1/0/22 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/23 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/24 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/25 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/26 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/27 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/28 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/29 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/30 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/31 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/32 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/33 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/34 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/35 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/36 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/37 auto on 3.5 IP Phone 3905 1 30.0
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/38 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/39 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/40 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/41 auto on 3.5 IP Phone 3905 1 30.0
Gi1/0/42 auto off 0.0 n/a n/a 30.0
Gi1/0/43 auto on 26.1 AIR-AP2802I-D-K9 4 30.0
Gi1/0/44 auto on 26.1 AIR-AP2802I-D-K9 4 30.0
Gi1/0/45 auto on 26.1 AIR-AP2802I-D-K9 4 30.0
Gi1/0/46 auto on 26.1 AIR-AP2802I-D-K9 4 30.0
Gi1/0/47 auto off 0.0 n/a n/a 30.0
Gi1/0/48 auto off 0.0 n/a n/a 30.0

The same phone will work in diffrent port but not the port which we were connected earlier like in log you can see may ports are off from GIG 1/0/-45 ports are connected with POE injuctor