On our cisco 4507 switch whenever a interface goes down the logs are not generated? Following commands are configured for logging :
logging buffered 16000 informational
logging console informational
logging monitor informational
logging facility local2
Output of show version is below :-
Cisco Internetwork Operating System Software
IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(18)EW3, RELEASE SOFTWARE (f
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Mon 07-Feb-05 19:21 by hqluong
Image text-base: 0x00000000, data-base: 0x010BFA78
Dagobah Revision 95, Swamp Revision 29
IGS_CORE1_DC_4507 uptime is 47 weeks, 1 day, 8 hours, 50 minutes
System returned to ROM by reload
System restarted at 16:10:59 IST Sat Mar 10 2007
System image file is "bootflash:"
cisco WS-C4507R (MPC8245) processor (revision 7) with 524288K bytes of memory.
Processor board ID FOX063925Z5
Last reset from Reload
22 Virtual Ethernet/IEEE 802.3 interface(s)
144 FastEthernet/IEEE 802.3 interface(s)
14 Gigabit Ethernet/IEEE 802.3 interface(s)
403K bytes of non-volatile configuration memory.
On a 45xx you need the command " looging event link-status" under the interface to generate the up/down logs
Along with the above command, you can also configure " logging event trunk-status" under your trunk interfaces