Dear all,
I have a POE Catalyst 3750 24 ports switch and 2 unit of Cisco IP phone (7940 & & 7911), the current scenario encountered for me is switchport fa0/22 can bring up IP phone 7911 but not phone 7940, but when I try the phones on other few different switchports there are no problem, other ports can bring up both phones, 7911 & 7940.
Example :-
Let's say I try phone 7911 and 7940 into switchport fa0/20, both tested successful and the phones were power up and operational.
But when I try connect phones to switchport fa0/22, phone 7911 was power up and successful on port fa0/22 but if connect the phone 7940 will have error log message and port fa0/22 remained down.
So far I have tried connect the 7940 phone to few other switchport tested okay but only having problem when using in port fa0/22, but if I connect phone 7911 on port fa0/22 everything is good.
All the switchports have the following similliar configuration with CDP and POE enabled :-
interface FastEthernet0/X
switchport access vlan 10
switchport mode access
switchport voice vlan 11
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
spanning-tree portfast
spanning-tree bpduguard enable
end
when I connect phone 7940 on port fa0/22 the following logs keep appearing and pouring out
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet2/0/22, changed state to down
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%LINK-3-UPDOWN: Interface FastEthernet2/0/22, changed state to down
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
%ILPOWER-7-DETECT: Interface Fa2/0/22: Power Device detected: Cisco PD (Switch 3750)
%ILPOWER-5-POWER_GRANTED: Interface Fa2/0/22: Power granted (Switch 3750)
%ILPOWER-5-IEEE_DISCONNECT: Interface Fa2/0/22: PD removed (Switch 3750)
Switch 3750# sh power inline fa0/22
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Fa0/22 auto off 0.0 n/a n/a 15.4
What is PD mean in the log? I have tried also shut and no shut port fa0/22 but same, this cannot be a bad phone or possible bad cable problem right because phone 7940 tested in other ports is ok and port fa0/22 can powered up phone 7911 without any problem.
Anyone have any idea what happening here? this symptom look very strange and weird to me, not sure how to check in the first place
