12-12-2011 08:29 PM - edited 03-07-2019 03:52 AM
I have 2 Catalyst 2924 switch in a home lab. Both of them have developed the same problem at the same time (strange). I have tried all that I can think of. I can telnet to them but cannot access via the console port. On a telnet session I execueted a "write erase, reload" on one of them. As I anticipated this threw me out of the telnet session and I presently have no access to that switch.
The console cable is fine, works for all other devices.
Any suggestions will be appreciated.
12-12-2011 09:14 PM
What do you see on the console screen when you try to enter into the device? any error messages popping up on screen? blank screen?
12-13-2011 06:48 AM
One of the things that can produce symptoms similar to what is described here is that the speed of the console port got changed. You might try setting the speed of your terminal emulator to various speeds, starting at 1200, and working up through 2400, 4800 etc.
HTH
Rick
12-13-2011 07:01 AM
Agree with Rick. The Baud Rate might have got changed. In this case, if you try to type something on the console, you will see some random characters popping up.
-Sweta
12-13-2011 08:07 AM
I have had that same problem had to chang speed to 9600 anything less or higher I got nothing but a blank screen.
12-13-2011 10:10 AM
i tried the baud rate changes from 1200 thru 19200, and still got no response. Black screen on putty. I can only now telnet to one of the switch, as the 'write erase', 'reload' has cleared the ip address that was used for telnet.
12-13-2011 10:22 AM
this is frustrating
i can see both switch in cdp neighbor, the one with the ip and the one that was write erased (no ip address). Both have no console access.
12-13-2011 10:42 AM
I sympathesize that it is frustrating and would like to find a solution. So here are a couple of things:
- if you connect to the console of one of the switches and power cycle it, do you see any output at all (even non legible characters count) on the console connection?
- from the switch that you can still access, would you post the output of show version?
- from the switch that you can still access would you do a show run and post anything and everything that is configured under line con 0?
HTH
Rick
12-13-2011 11:31 AM
Thanks Richard Burts!
Info contained below.
S3#show ver
Cisco Internetwork Operating System Software
IOS (tm) C2900XL Software (C2900XL-C3H2S-M), Version 12.0(5.2)XU, MAINTENANCE INTERIM SOFTWARE
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Mon 17-Jul-00 17:35 by ayounes
Image text-base: 0x00003000, data-base: 0x00301F3C
ROM: Bootstrap program is C2900XL boot loader
S3 uptime is 16 minutes
System returned to ROM by power-on
System image file is "flash:c2900XL-c3h2s-mz-120.5.2-XU.bin"
cisco WS-C2924-XL (PowerPC403GA) processor (revision 0x11) with 8192K/1024K bytes of memory.
Processor board ID FAB0510Y0V0, with hardware revision 0x01
Last reset from power-on
Processor is running Enterprise Edition Software
Cluster command switch capable
Cluster member switch capable
24 FastEthernet/IEEE 802.3 interface(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:05:5E:50:E3:C0
Motherboard assembly number: 73-3382-08
Power supply part number: 34-0834-01
Motherboard serial number: FAB05105173
Power supply serial number: DAB04525S0R
Model revision number: A0
Motherboard revision number: C0
Model number: WS-C2924-XL-EN
System serial number: FAB0510Y0V0
Configuration register is 0xF
S3#
12-13-2011 11:37 AM
fyi, there is no output, legible or non-legible characters with power cycle.
S3#show run
Building configuration...
Current configuration:
!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname S3
!
enable secret 5 $1$KOoa$BvgxQSs8XKOEnIopONlBs/
!
!
ip subnet-zero
!
!
interface FastEthernet0/1
!
(EDITED OUT, IN CONSIDERATION OF SPACE)
!
interface FastEthernet0/24
!
interface VLAN1
ip address 192.168.1.7 255.255.255.0
no ip directed-broadcast
no ip route-cache
!
ip default-gateway 192.168.1.1
banner login ^C ACCESS RESTRICTED ^C
banner motd ^C AUTHORIZED PERSONEL ONLY ^C
!
line con 0
password 7 05080F1C2243
logging synchronous
transport input telnet
stopbits 1
line vty 0 4
password 7 08334943060D00
login
transport input telnet
line vty 5 15
password 7 08334943060D00
login
transport input telnet
!
end
S3#
12-13-2011 12:00 PM
Maybe it's not the problem but i'never see transport input telnet on console port, try to remove this and also the loggin synchronus... try to configure only password and login command.
12-13-2011 12:33 PM
Leave the logging synchronous on as that stops console messages over writing what you type while it scrolls on the screen remove transport inputtelent from console session as leaving this on means the console port should be expecting a telnet connection coming in.
Sent from Cisco Technical Support iPhone App
12-13-2011 12:35 PM
wow it seems the same who i've written...
12-13-2011 02:55 PM
Thanks everyone, the "transport input telnet" was originally not there. I just added it trying different scenarios. Console still doesn't respond; with or without it.
What should "transport input" be set to?
12-13-2011 04:09 PM
no transport input anything on line con 0
Sent from Cisco Technical Support iPad App
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide