I am in the process of replacing PA-5020 HA A/P pair with PA-5220 HA A/P pair. At some point, we will remove 5020 and introduce a 5220 and this needs ARP refresh on all interfaces. is there a script/process I can use to ensure the ARPs are refreshed as soon as the new firewall is connected?
Here is what I do on a high level:
1. make sure both pairs are on the same code version
2. export config from old pair and put into new pair, be mindful not so save management IP etc so both pairs are accessible
3. make sure new pair has everything setup, base config for management, HA setup etc.
on cut over day:
4. shut down old pair
5. move cables to the new pair
Downtime should be minimal. If you want to clear arp cache, log into the upstream and downstream switches/routers and clear arp on them.
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