Link flap / Err-disable when plugging phone into 3550

ande0255ande0255 Banned Posts: 1,178
Just got a 7940 in for my lab, and when plugging it into the 3550 I have, the port light blinks amber until it eventually stops and gives the following error:

*Mar 1 00:21:14.267: %PM-4-ERR_DISABLE: link-flap error detected on Fa0/47, putting Fa0/47 in err-disable state

The weird thing is that the 'show power inline' command works on this switch but doesn't show any information on the ports, and there doesn't seem to be any commands that begin with 'power' that I can use in either global or interface configuration.

Made sure to shut / no shut port again after doing switchport mode access / switchport voice vlan 10 / spanning-tree portfast and still gives the same results. Also tried both a cross-over and straight through cable just for the heck of it and same thing.

Anyone else run into this? I'm wondering if I got a switch that is not PoE capable with a PoE IOS running on it, below is the show ver for the switch:

Switch#show ver
Cisco IOS Software, C3550 Software (C3550-IPSERVICESK9-M), Version 12.2(50)SE1, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Mon 06-Apr-09 08:51 by amvarma
Image text-base: 0x00003000, data-base: 0x013EEB64

ROM: Bootstrap program is C3550 boot loader

Switch uptime is 29 minutes
System returned to ROM by power-on
System image file is "flash:/c3550-ipservicesk9-mz.122-50.SE1.bin"

This product contains cryptographic features and is subject to United
States an
*Mar 1 00:29:47.907: %SYS-5-CONFIG_d local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing CI: Configured from console by consoleisco cryptographic products may be found at:
Export Compliance Product Report Application

If you require further assistance please contact us by sending email to
[email protected].

Cisco WS-C3550-48 (PowerPC) processor (revision L0) with 65526K/8192K bytes of memory.
Processor board ID CAT0801X0YJ
Last reset from warm-reset
Running Layer2/3 Switching Image

Ethernet-controller 1 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 2 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 3 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 4 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 5 has 1 Gigabit Ethernet/IEEE 802.3 interface

Ethernet-controller 6 has 1 Gigabit Ethernet/IEEE 802.3 interface

48 FastEthernet interfaces
2 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.
384K bytes of flash-simulated NVRAM.
Base ethernet MAC Address: 00:0E:D7:DB:A7:00
Motherboard assembly number: 73-5701-09
Power supply part number: 34-0967-01
Motherboard serial number: CAT07520LLZ
Power supply serial number: DTH075035TE
Model revision number: L0
Motherboard revision number: A0
Model number: WS-C3550-48-SMI
System serial number: CAT0801X0YJ
Configuration register is 0x10F


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