Hello @Marsooq_A
thank you for the post!
First of all the PA-3400 series supports only PAN-OS 10.2, so to register this Firewall to Panorama you must be running Panorama on PAN-OS 10.2 as well. This is the only pre-requisite I can think of.
Regarding the procedure, under the assumption that PA-3430 will have the same configuration and function, I would go with below steps.
1.) Perform initial configuration of PA-3430. Configure management interface, dns server and Panorama IP address/FQDN. The IP address of management interfaces should be obviously unique and not duplicated with existing PA-3260. Make sure that all licenses are applied and install latest application/threat content. Upgrade PAN-OS if necessary. If you are using HA pair, do the same for both Firewalls. If you are not planning to use Panorama to push HA configuration, then at this point I would build HA.
2.) Register both PA-3430 to Panorama and make sure that both Firewalls come online. If PA-3430 will serve the same function/purpose as PA-3260, I would place this Firewall to the same Device Group. For Template Stack, I would clone existing PA-3260 Template Stack and modify setting in device specific Template in the case there is something that will be either not compatible with new PA-3430 or you want to customize something for this Firewall. After Firewalls are assigned to Device Group/Template Stack, I would perform verification. If it there is no issue, I would push the configuration.
3.) As a next step, I would plan cut over to PA-3430. If rack space allows, it would be ideal to place PA-3430 pair close to PA-3260 to potentially re-use the same cables/optics. On the day of migration, I would announce down time and moved cables across from PA-3260 to PA-3430. Since new Firewall will be using the same configuration, all downstream and upstream devices should update their ARP tables with new MAC address trough GARP. If this does not happen, you might have to clear old entry manually.
4.) After the migration, I would use the opportunity of maintenance window and perform failover test and make sure full functionality for both Firewalls in HA.
5.) As the final step, I would remove PA-3260 from Panorama and clean up all related configuration.
The above steps might be too rough without going into details. If you give more details about challenges you face, I will elaborate more.
Kind Regards
Pavel
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