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Why do some platforms require a reload after performing configuration rollback but not others?

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Why do some platforms require a reload after performing configuration rollback but not others?

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A. On PIX/ASA/FWSM devices, Security Manager uses the replace config option on the device’s SSL interface to perform the equivalent of a reload (xlates are cleared, IPsec tunnels are torn down, and so on). Routers running IOS 12.3(7)T or later use the configure replace command to replace the running config with the contents of a configuration file. Support for this command is dependent on the IOS version installed on the router: –On routers running IOS 12.3(7)T or later, Security Manager copies the configuration file to the startup configuration before executing the configure replace command. If the configure replace operation fails, Security Manager issues the reload command to reload the operating system using the contents of the startup configuration. Please note that the reload command restarts the system, which might result in a temporary network outage. –On routers running a version prior to 12.3(7)T, Security Manager copies the configuration file to the startup configuration and

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