I found that each time the switch is 'pinged' the message shows up.
So I may have found my answer impericaly...
I havn't turned on any debugs (on purpose), note that this unit came as a donation and has an 'experimental version of 12.1 IOS in it.
Output of Show debug
------------------------------
General Ethernet:
Ethernet network interface debugging is on
Output of Show Ver:
(note I modified The MAC Address for security reasons)
------------------------------------------------
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Experimental Version 12.1(20020216:220723) [phwang-wv1 148]
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Thu 21-Feb-02 15:54 by phwang
Image text-base: 0x00003000, data-base: 0x006C71E4
ROM: Bootstrap program is C3550 boot loader
switches5 uptime is 1 year, 1 week, 4 days, 23 hours, 41 minutes
System returned to ROM by power-on
System restarted at 11:22:03 PDT Tue Apr 30 2002
System image file is "flash:c3550-i5q3l2-mz.vrf0"
cisco WS-C3550-48 (PowerPC) processor with 65526K/8192K bytes of memory.
Last reset from warm-reset
Bridging software.
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/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)
The password-recovery mechanism is enabled.
384K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: xx:xx:xx:xx:xx:xx
Configuration register is 0x10F
