Choosing an Upgrade Method: Remote vs. Streaming

Cisco provides two methods (or ‘sources’) for upgrading AsyncOS on your appliances:

• Streaming upgrades — Each appliance downloads the AsyncOS upgrades via HTTP directly from the Cisco content security update servers.
• Remote upgrades — You only download the upgrade image from Cisco one time, and then serve it to your appliances. Your appliances then download the AsyncOS upgrades from a server within your network.

You will configure the upgrade method in Configuring Upgrade and Service Update Settings. Optionally, use the updateconfig command in the CLI.