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Console unresponsive, outputting odd characters. I know, again...

I have a second-hand Catalyst 3550 which I am having trouble connecting to with a console cable. Please bear with me, I'm very new to this. I know similar things have come up before but I haven't had any joy.

I'm using PuTTY on a Windows 10 laptop with a USB-Serial cable connected to a Cisco console cable at 9600 baud. This works on another two switches and two routers. On the 3550 it is very unresponsive when trying to type. It seems that it receives commands but doesn't display most characters. If I hold the keys down they show up, but this seems to duplicate the letter.

]ZX+K▒▒▒ the
flash filesystem. The following commands will initialize
the flash filesystem, and finish loading the operating
system software:

flash_init
boot

switch:
switch: set▒k▒▒ݹ cmd: sssssseeeetttt
switch: ut,K▒
switch:
switch:
switch:i0]: Total bytes: 15998976
flashfs[0]: Bytes used: 6638080
flashfs[0]: Bytes available: 9360896
flashfs[0]: flashfs fsck took 16 seconds.
...done Initializing Flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
switch:
switch: tU▒
switch: e==Q=flash:c3550-i9q3l2-mz.121-20.EA1a/c3550-i9q3l2-mz.121-20.EA1a.bin
MAC_ADDR=00:13:7F:5D:03:80
MODEL_NUM=WS-C3550-24PWR-SMI
MODEL_REVISION_NUM=J0
MOTHERBOARD_ASSEMBLY_NUM=73-8100-09
MOTHERBOARD_REVISION_NUM=A0
MOTHERBOARD_SERIAL_NUM=CAT09090FME
POWER_SUPPLY_PART_NUM=341-0029-03
POWER_SUPPLY_SERIAL_NUM=DTH09064RL8
SYSTEM_SERIAL_NUM=CAT0909K0F5
switch:

See above various attempts at set, unset BAUD, flash_init. As far as I can see it seems to boot OK, but is similarly unresponsive and confused in output. I've tried following configuration reset steps but it appears to freeze; at least it stops updating anything on the console. I saw somewhere mention of jumpers, but I can't find anything more than this.No chance of a hardware reset, is there? If you're able to offer any advice please don't skip any steps. I haven't done this before and if you don't mention something then I won't know to do it. I have only been able to connect by console, I don't know how the telnet works. This is all of my typing, but below is the switch output from booting and some input attempts. Thanks for trying, good luck!

s[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 15998976
flashfs[0]: Bytes used: 6638080
flashfs[0]: Bytes available: 9360896
flashfs[0]: flashfs fsck took 16 seconds.
...done Initializing Flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
###############################################################################################################################################################################################################################################################
point: 0x3000
executing...
▒K
K{scor disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I9Q3L2-M), Version 12.1(20)EA1a, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Mon 19-Apr-04 21:42 by yenanh
Image text-base: 0x00003000, data-base: 0x006B3454


Initializing flashfs...▒l▒▒K+▒k
flashfs[1]: Total bytes: 15998976
flashfs[1]: Bytes used: 6638080
flashfs[1]: Bytes available: 9360896
flashfs[1]: flashfs fsck took 8 seconds.
flashfs[1]: Initialization complete.
...done Initializing flashfs.hU Interface Tests : End, Status Passed
POST: Switch Core Tests : Begin
POST: CPU Interface 2nd Stage Tests : Begin
POST: CPU Interface 2nd Stage Tests : End, Status Passed
POST: CAM Subsystem Tests : Beginests : Begint 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 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: 00:13:7F:5D:03:80
Motherboard assembly number: 73-8100-09
Power supply part number: 341-0029-03
Motherboard serial number: CAT09090FME
Power supply serial number: DTH09064RL8
Model revision number: J0
Motherboard revision number: A0
Model number: WS-C3550-24PWR-SMI
System serial number: CAT0909K0F5

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]:
00:00:33: %SPANTREE-5-EXTENDED_SYSID: Extended SysId enabled for type vlan
00:00:37: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I9Q3L2-M), Version 12.1(20)EA1a, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Mon 19-Apr-04 21:42 by yenanh
00:00:37: %SNMP-5-COLDSTART: SNMP agent on host Switch is undergoing a cold start▒K
c6{s3K;▒▒
▒K{sFK
c{;▒▒-+▒{no]:
% Please answer 'yes' or 'no'.
Would you like to enter the initial configuration dialog? [yes/no]:
% Please answer 'yes' or 'no'.
Would you like to enter the initial configuration dialog? [yes/no]: ▒n
▒▒+#

00:01:48: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively down
00:01:49: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
Switch>
Switch>name, or unable to find computer address
Switch>
Switch#
Switch# command or computer name, or unable to find computer address
Switch#A
^
% Invalid input detected at '^' marker.

Switch#e tl $hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhajK▒C6{s3K;K6▒
Switch(config)#
Switch(config)#
Switch(config)#
% Incomplete command.

Switch(configl▒▒K;K6▒▒l{s3K;K6▒
Switch(config)#
Switch(config)#
Switch(config)#
Switch(config)#
Switch(config)#interface
Switch(config)#
Switch(config)#
Switch(config)#

Everyone's tags (3)
4 REPLIES 4
Hall of Fame Master

Seeing the title of the post

Seeing the title of the post describe odd characters of console output made me think that this was probably a case where the speed of the console connection had been changed. This is generally pretty easy to fix - you change the speed of the connection for your terminal emulator starting at 1200, working through 2400, 4800, perhaps up to 115000.

However most of the output shown in the post seems to be pretty clear when it is booting and just displaying the boot messages. So I am not sure that it is really a change in speed of the console. You might try the various speeds, just to be sure, but it may be that you are dealing with something other than a console speed issue.

HTH

Rick 

Thank you Rick. I did try

Thank you Rick. I did try working through the speeds, but none work better than 9600; some work worse. It does sound a bit like people have described for incorrect connection speeds but I have been unable to implement any of the suggested fixes as it's difficult to see outputs.

Beginner

Re: Thank you Rick. I did try

I've the same issue with a 2951 Rtr.

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Hall of Fame Master

Re: Thank you Rick. I did try

This seems different from the original post. Where the original post had lots of output that was readable characters, this output has no readable characters in its output. So this looks more like a case where the console speed of the device does not match the speed set in the terminal emulator. So I would suggest that you try various speeds in your terminal emulator starting at 1200 and working up through alternatives 2400 4800 9600 to 115000.

 

HTH

 

Rick

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