From: Ivan Kuchin (ivan@iip.net)
Date: Thu Apr 13 2006 - 10:32:35 GMT-3
Really ! On old 3550 IOS keepalive 10. In new I'm use 122-25 no keepalive.
Similar situation on 3560, 2970, 2900XL - keepalive not set.
Thank you for advice. I setted no keepalive and wait for accident or not .....
> Ivan,
>
> I had similar case but Cat2950 switches were involved, and because of some
> loop they suddenly started to shutdown uplinks with the same message. TAC
> solution
> was to enter "no keepalive" on each port. What's interesting is that
> 3500-XL switches, also deployed at customer site, have "no keepalive" as
> default. Cisco said that "no keepalive" will be default in newer ios
> versions.
>
> Regards,
> Sasa
>
>
> ----- Original Message -----
> From: "Ivan" <ivan@iip.net>
> To: <ccielab@groupstudy.com>
> Sent: Thursday, April 13, 2006 1:03 PM
> Subject: OT: LOOP_BACK_DETECTED
>
> > Hello group !
> >
> > Real life situation. There is 15 switches (Cat 3500 & Cat 3550)
> > connected
> > sequence. Some times ago LOOP_BACK_DETECTED appear on Gigabit interface
> > and
> > port go down. This situation repeat some times between the same switches.
> > I
> > know that neither Cables nor GBIC's don't modify or touched at accident
> > time.
> > CISCO site give poor information about this error.
> > "This message means that the loop-back condition might be caused by a
> > balun
> > cable being accidentally plugged into the port. [chars] is the port."
> >
> > Does someone has such situation ? And what real cause this accident ?
> >
> > show version on switch wich LOOP_BACK_DETECT
> > SW-2#sh ver
> > Cisco Internetwork Operating System Software
> > IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(11)EA1, RELEASE
> > SOFTWARE (fc1)
> > Copyright (c) 1986-2002 by cisco Systems, Inc.
> > Compiled Wed 28-Aug-02 10:03 by antonino
> > Image text-base: 0x00003000, data-base: 0x0071D658
> >
> > ROM: Bootstrap program is C3550 boot loader
> >
> > Giga-IOC uptime is 1 hour, 0 minutes
> > System returned to ROM by power-on
> > System restarted at 13:27:17 MSD Thu Apr 13 2006
> > System image file is "flash:c3550-i5q3l2-mz.121-11.EA1.bin"
> >
> > cisco WS-C3550-24 (PowerPC) processor (revision J0) with 65526K/8192K
> > bytes of
> > memory.
> > Processor board ID CAT0727Y0A3
> > 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 1 Gigabit Ethernet/IEEE 802.3 interface
> >
> > Ethernet-controller 4 has 1 Gigabit Ethernet/IEEE 802.3 interface
> >
> > 24 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: 00:0D:65:12:9E:00
> > Motherboard assembly number: 73-5700-10
> > Power supply part number: 34-0966-02
> > Motherboard serial number: CAT072702G9
> > Power supply serial number: DTH07260BGH
> > Model revision number: J0
> > Motherboard revision number: A0
> > Model number: WS-C3550-24-SMI
> > System serial number: CAT0727Y0A3
> > Configuration register is 0x10F
> >
> >
> >
> >
> > --
> > Ivan
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
-- iWAN kU^IN (mail to: ivan@iip.net) NOC iip.net 137-31-04
This archive was generated by hypermail 2.1.4 : Mon May 01 2006 - 11:41:57 GMT-3