Wondering if you can help me.
I have a Cisco WS-C2960S-48FPS-L switch which connects some VOIP conference phones (Polycom SoundStation IP7000 or IP6000). The phones don't come up. It looks like the switch is not providing enough power. If I connect any other phone (Siemens OpenStage, OptiPoint) it comes up w/o problems.
One more interesting thing. When I set a static power on the port the Polycom phones work fine.
Is there any bug that I am running into?
In the log I can see the following messages:
Dec 3 14:42:01.661 GMT: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/18: Power granted
Dec 3 14:44:08.665 GMT: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/18: Power granted
Dec 3 14:46:22.699 GMT: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/18: Power granted
Switch type: cisco WS-C2960S-48FPS-L
IOS version: c2960s-universalk9-mz.122-58.SE1.bin
LLDP is running on the switch.
The port config:
switchport access vlan 104
switchport mode access
switchport voice vlan 404
switchport port-security maximum 7
switchport port-security aging time 1
switchport port-security aging type inactivity
no logging event link-status
no snmp trap link-status
spanning-tree portfast disable
Working scenario with the static power setting:
power inline consumption 15400
power inline static
switch#show lldp neighbors gigabitEthernet 1/0/18
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other
Device ID Local Intf Hold-time Capability Port ID
Polycom SoundStationGi1/0/18 120 T 0004.f2eb.6504
Total entries displayed: 1
Please try to perform the below debug and check the logs. This issue seems to be matching with known DDTS
#debug ilpower port
#debug ilpower powerman
CSCtj20486 - phone requests 13W but it seems the switch just provides 9.8W
some time the issue was resolved by upgrading the polycom firmware to a newer version 3.3.1
Please verify the logs and firmware version, then share the detail.
*** Please rate if the post is useful ***
One more interesting thing...when I disabled the lldp feature on that port the phone worked just fine and the switch was even able to recognize the phone's power class.
That means that there must be some glitch when the phone negotiates its power capabilities with the switch by means of lldp.
Following lines were added to disable lldp on the port.
Interface giga 1/0/18
no lldp receive
no lldp transmit
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