Replacing And Rolling-Back Configuration - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 3 Configuring the Switch for the First Time
When you use the boot system and boot bootldr global configuration commands, you affect only the
Note
running configuration. To save the configuration for future use, you must save the environment variable
settings to your startup configuration, which places the information under ROM monitor control. Enter
the copy system:running-config nvram:startup-config command to save the environment variables
from your running configuration to your startup configuration.
You can view the contents of the BOOT and BOOTLDR variables using the show bootvar command.
This command displays the settings for these variables as they exist in the startup configuration and in
the running configuration if a running configuration setting differs from a startup configuration setting.
This example shows how to check the BOOT and BOOTLDR variables on the switch:
Switch# show bootvar
BOOTLDR variable = bootflash:cat4000-is-mz,1;
Configuration register is 0x0
Switch#

Replacing and Rolling-Back Configuration

For detailed information about this feature, see the "Configuration Replace and Configuration Rollback"
chapter of the
The following restrictions pertain to the use of this feature on a Catalyst 4500 series switch:
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Managing Configuration Files
You cannot use this feature to convert a VSS system to a non-VSS (standalone) system, or the other
way around. The configuration that is replaced and the new configuration that is replacing the
existing, must both apply to the same kind of system - whether VSS or non-VSS.
Do not use the configure replace command to replace wireless configuration with non-wireless
configuration, or the other way around.
A Catalyst 4500 series switch in a high availability (HA) configuration cannot accept any
configuration changes when the standby supervisor is booting.
This restriction also applies to the configure replace command.
If the hw-module line in the existing configuration is being replaced by configuration with a
different hw-module line, you must manually reload the entire system. To locate the hw-module line
see the following sample output (truncated output):
Switch# show running-config brief
Building configuration...
Current configuration : 8730 bytes
Last configuration change at 19:40:01 UTC Mon Oct 26 2015 by cisco
version 15.2
-----output truncated-----
hw-module module 5 mode 1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Replacing and Rolling-Back Configuration
feature guide on cisco.com.
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