On our PoE switch, IP phones reboot many times during the day. I checked the switch. It did not reboot.
Is there a way to verify power consumption by phones on the switch?
show power inline
Note however that when phones mysteriously reload, that is likely due to broken network connectivity, not power problem.
Please check the CUCM server sys log, if the phones are missing 3 hello packets they will re-register, and if there is no secondary server it will look like they are rebooting, if the sys log indicates that the device is rebooting itself then I would setup a sniffer trace to check what is going on, or if you have a monitoring system that might indicate a flapping issue on the network.
Switch is WS-C2960-24PC-L model
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Fri 26-Mar-10 09:14 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01400000
ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(44r)SE4, RELEASE SOFTWARE (fc1)
TNSWAGCS01028 uptime is 2 weeks, 3 days, 22 hours, 11 minutes
System returned to ROM by power-on
System image file is "flash:c2960-lanbasek9-mz.122-50.SE4/c2960-lanbasek9-mz.122-50.SE4.bin"
cisco WS-C2960-24PC-L (PowerPC405) processor (revision E0) with 65536K bytes of memory.
Processor board ID FOC1451X63T
Last reset from power-on
2 Virtual Ethernet interfaces
24 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
64K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 8C:B6:4F:C6:0C:80
Motherboard assembly number : 73-11305-09
Power supply part number : 341-0266-03
Motherboard serial number : FOC14503Y0C
Power supply serial number : LIT1448043W
Model revision number : E0
Motherboard revision number : A0
Model number : WS-C2960-24PC-L
System serial number : FOC1451X63T
Top Assembly Part Number : 800-29397-05
Top Assembly Revision Number : C0
Version ID : V04
CLEI Code Number : COMCS00ARA
Hardware Board Revision Number : 0x01
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 WS-C2960-24PC-L 12.2(50)SE4 C2960-LANBASEK9-M
Since when the problem started?
is it happening to all phones under 1 switch? how about the others?
Did you experienced call drop and restart while on a call on that phone?
Try the following to further isolate the cause;
- register the phones to the other CUCM and see if that fix the issue.
- try to use static or set the dhcp lease time to infinte.
- Check all switch in between for any error logs
We are seeing similar behavior. Our cases seem to be triggered by one VoiP connected PC that freezes up. The connected phone will reboot and within minutes, other random phones connected on the switch will begin rebooting.