What happens when I push a policy from Panorama to a device-group firewall? Does Panorama always push the entire configuration file, or does it first perform a 'diff,' and only push the changes? If it performs a diff, what is the underlying mechanism it uses to track the changes? Is it some sort of table of rule hashes, etc? It seems pretty silly to push an entire config if only a single line changes.
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As per my understanding, upon commit the PAN-OS will always verify the difference between running config and the candidate config and then push only the difference or changes to the firewall.
Hope this helps.
See the full description of the commit process and all the options in the Panorama Admin guide page 79
Commit Changes on Panorama
When you edit the configuration on Panorama, you are making changes to the candidate configuration file. The
candidate configuration is a copy of the running configuration along with the modifications that you have saved
using the Save option. The Panorama web interface displays all the configuration changes immediately, however
the changes are not implemented until you commit the changes. The commit process validates the changes in
the candidate configuration file and saves it as the running configuration on Panorama.
When a commit from Panorama to a device group, It is a Full commit. But you do have some options at the bottom of the screen that you can choose:
Include Device and Network Templates—
This option is available when committing a Device Group from Panorama and is a combo operation that will include both the device and network template changes. The template that will be applied to the device is the template that the device belongs to as defined in Panorama > Templates. You can also select Commit Type Template to commit templates to devices.
I'm familiar with the Include Device and NetworkTemplates checkbox when performing a Device Group commit. What I wanted to know, is what type of commit actually takes place on the managed firewall(s) when just a Device Group or Device and Network Templates commit is performed. Is it a Granular Commit or a Full Commit?
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