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New Member

write memory

Hi !

I have change some configuration parameter on catalyst 1900 switch after reboot or reload some switch has lost the configuration I have changed. If I'm remember correctly, it exist 2 types of mode on this switch series.

The first type and the default : when configuration it's automaticly save in the NVRAM, it's not necessaily to issue "write memory" or anything else like that.

The second is like the more recent switch like Catalyst 2960, where we have to save configuration before shutdown the switch if configuration must be retain.

1- I would like to know how can I confirm in which of this mode my switch is running.

2- How can I switch between those 2 types

3- How can I make sure my configuration is save before reload, when my switch is running in the none default type ( I already tried "write mem" and "copy run start" command, no wriet command exist, and for the copy command the only parameter is TFTP....


Re: write memory

If Catalyst switch is running CATOS image, you don't need to save config change. System will do it automatically.

It looks like your switch is running IOS. In that case, you have to use "wr mem" or "copy run start" to save any config change.

After you save any config change, you can use "show start" to confirm if the change has been saved correctly. When reloading the switch, capture console output to see if there is any message to indicate why the new config is not taken by system.

New Member

Re: write memory

Hi !

Here copy of the show version output command :

Cisco Catalyst 1900/2820 Enterprise Edition Software

Version V9.00.06

Copyright (c) Cisco Systems, Inc. 1993-1999

XXXXXXXXXXXXXX uptime is 1day(s) 05hour(s) 07minute(s) 10second(s)

cisco Catalyst 1900 (486sxl) processor with 2048K/1024K bytes of memory

Hardware board revision is 5

Upgrade Status: No upgrade currently in progress.

Config File Status: No configuration upload/download is in progress

27 Fixed Ethernet/IEEE 802.3 interface(s)


and here available command in this switch


Exec commands:

clear Reset functions

configure Enter configuration mode

copy Copy configuration or firmware

delete Reset configuration

disable Turn off privileged commands

enable Turn on privileged commands

exit Exit from the EXEC

help Description of the interactive help system

menu Enter menu interface

ping Send echo messages

reload Halt and perform warm start

session Tunnel to module

show Show running system information

terminal Set terminal line parameters

vlan-membership VLAN membership configuration

D01-AMQU1-01#copy ?

nvram Copy configuration to TFTP server

tftp: Copy from a TFTP server

xmodem: Copy from a XMODEM host


no "copy run start" or "write mem" command are available in that switch !! And by the prompt # to indicate we are in the enable mode I think it is an IOS not a CatOS is running in that switch.

Re: write memory

How long have you been using this switch? :)

I did not notice it's 1900. It should be end of life long time ago.

The configuration changes on a 1900 are saved automatically. "show run" will tell you the config.

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