Upgrade an HA Firewall Pair to PAN-OS 9.1

1. Save a backup of the current configuration file.
   Although the firewall automatically creates a backup of the configuration, it is a best practice to create and externally store a backup before you upgrade.

   Perform these steps on each firewall in the pair:
   1. Select DeviceSetupOperations and click Export named configuration snapshot.

   2. Select the XML file that contains your running configuration (for example, running-config.xml) and click OK to export the configuration file.

   3. Save the exported file to a location external to the firewall. You can use this backup to restore the configuration if you have problems with the upgrade.
2. Select DeviceSupport and Generate Tech Support File.
   Click Yes when prompted to generate the tech support file.
3. If you have enabled User-ID, after you upgrade, the firewall clears the current IP address-to-username and group mappings so that they can be repopulated with the attributes from the User-ID sources. To estimate the time required for your environment to repopulate the mappings, run the following CLI commands on the firewall.
   • For IP address-to-username mappings:
     • show user user-id-agent state all
     • show user server-monitor state all
   • For group mappings: show user group-mapping statistics
4. Ensure that each firewall in the HA pair is running the latest content release version.
   Refer to the release notes for the minimum content release version you must install for a PAN-OS 9.1 release. Make sure to follow the Best Practices for Application and Threat Updates.
   1. Select DeviceDynamic Updates and check which Applications or Applications and Threats to determine which update is Currently Installed.

   2. If the firewalls are not running the minimum required content release version or a later version required for PAN-OS 9.1, Check Now to retrieve a list of available updates.
   3. Locate and Download the desired content release version.
      After you successfully download a content update file, the link in the Action column changes from Download to Install for that content release version.
   4. Install the update. You must install the update on both peers.
5. Determine the Upgrade Path to PAN-OS 9.1
   You cannot skip installation of any feature release versions in the path from the currently running PAN-OS version to PAN-OS 9.1.0.

   Review the known issues and changes to default behavior in the Release Notes and upgrade/downgrade considerations in the New Features Guide for each release through which you pass as part of your upgrade path.
6. Disable preemption on the first peer in each pair. You only need to disable this setting on one firewall in the HA pair but ensure that the commit is successful before you proceed with the upgrade.
   1. Select DeviceHigh Availability and edit the Election Settings.
   2. If enabled, disable (clear) the Preemptive setting and click OK.

   3. Commit the change.
7. Suspend the primary HA peer to force a failover.
   (Active/passive firewalls) For firewalls in an active/passive HA configuration, suspend and upgrade the active HA peer first.

   (Active/active firewalls) For firewalls in an active/active HA configuration, suspend and upgrade the active-primary HA peer first.
   1. Select DeviceHigh AvailabilityOperational Commands and Suspend local device for high availability.
   2. In the bottom-right corner, verify that the state is suspended.
      The resulting failover should cause the secondary HA peer to transition to active state.

      The resulting failover verifies that HA failover is functioning properly before you upgrade.
8. Install PAN-OS 9.1 on the suspended peer.
   1. On the first peer, select DeviceSoftware and click Check Now for the latest updates.
   2. Locate and Download PAN-OS 9.1.0.
      If your firewall does not have internet access from the management port, you can download the software image from the Palo Alto Networks Support Portal and then manually Upload it to your firewall.
   3. After you download the image (or, for a manual upgrade, after you upload the image), Install the image.

   4. After the installation completes successfully, reboot using one of the following methods:
      • If you are prompted to reboot, click Yes.
      • If you are not prompted to reboot, select DeviceSetupOperations and Reboot Device.
   5. After the device finishes rebooting, view the High Availability widget on the Dashboard and verify that the device you just upgraded is in sync with the peer.

9. Restore HA functionality to the primary HA peer.
   1. Select DeviceHigh AvailabilityOperational Commands and Make local device functional for high availability.
   2. In the bottom-right corner, verify that the state is Passive. For firewalls in an active/active configuration, verify that the state is Active.
   3. Wait for the HA peer running configuration to synchronize.
      In the Dasbhoard, monitor the Running Config status in the High Availability widget.
10. On the secondary HA peer, suspend the HA peer.
    1. Select DeviceHigh AvailabilityOperational Commands and Suspend local device for high availability.
    2. In the bottom-right corner, verify that the state is suspended.
       The resulting failover should cause the primary HA peer to transition to Active state.
11. Install PAN-OS 9.1 on the secondary HA peer.
    1. On the second peer, select DeviceSoftware and click Check Now for the latest updates.
    2. Locate and Download PAN-OS 9.1.0.
    3. After you download the image, Install it.
    4. After the installation completes successfully, reboot using one of the following methods:
       • If you are prompted to reboot, click Yes.
       • If you are not prompted to reboot, select DeviceSetupOperations and Reboot Device.
12. Restore HA functionality to the secondary HA peer.
    If your HA firewalls have local policy rules configured, upon upgrade to PAN-OS 9.1, each peer independently assigns UUIDs for each rule. Because of this, the peers will show as out of sync until you sync the configuration (DashboardWidgetsSystemHigh AvailabilitySync to peer).
    1. Select DeviceHigh AvailabilityOperational Commands and Make local device functional for high availability.
    2. In the bottom-right corner, verify that the state is Passive. For firewalls in an active/active configuration, verify that the state is Active.
    3. Wait for the HA peer running configuration to synchronize.
       In the Dasbhoard, monitor the Running Config status High Availability widget.
13. Re-enable preemption on the HA peer where it was disabled in the previous step.
    1. Select DeviceHigh Availability and edit the Election Settings.
    2. Enable (check) the Preemptive setting and click OK.
    3. Commit the change.
14. Verify that both peers are passing traffic as expected.
    In an active/passive configuration, only the active peer should be passing traffic; both peers should be passing traffic in an active/active configuration.

    Run the following CLI commands to confirm that the upgrade succeeded:

    • (Active peers only) To verify that active peers are passing traffic, run the show session all command.
    • To verify session synchronization, run the show high-availability interface ha2 command and make sure that the Hardware Interface counters on the CPU table are increasing as follows:
      • In an active/passive configuration, only the active peer shows packets transmitted; the passive peer will show only packets received.
        If you enabled HA2 keep-alive, the hardware interface counters on the passive peer will show both transmit and receive packets. This occurs because HA2 keep-alive is bi-directional, which means that both peers transmit HA2 keep-alive packets.
      • In an active/active configuration, you will see packets received and packets transmitted on both peers.