Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

You can download AsyncOS upgrade images to a local server and host upgrades from within your own 
network rather than obtaining upgrades directly from Cisco’s update servers. Using this feature, an 
upgrade image is downloaded via HTTP to any server in your network that has access to the Internet. If 
you choose to download the upgrade image, you can then configure an internal HTTP server (an “update 
manager”) to host the AsyncOS images to your Cisco appliances. 

Use a local server if your appliance does not have access to the internet, or if your organization restricts 
access to mirror sites used for downloads. Downloading AsyncOS upgrades to each appliance from a 
local server is generally faster than downloading from the Cisco IronPort servers. 

Cisco recommends using a local server only for AsyncOS upgrades. If you use a local update server for 
security update images, the local server does not automatically receive security updates from Cisco 
IronPort, so the appliances in your network may not always have the most current security services. 

Configure a local server to retrieve and serve the upgrade files.

Download the upgrade files.

Configure the appliance to use the local server using either the Security Services > Service Updates page 
in the GUI or the 

updateconfig

 command in the CLI.

Upgrade the appliance using either the System Administration > System Upgrade page or the 

upgrade

 

command in the CLI.

For downloading AsyncOS upgrade files, you must have a system in your internal network that has: