The PA-500 has an ARP limit of 500.
The PA-2020 has an ARP limit of 1000.
The PA-2050 has an ARP limit of 2500.
I was able to work around the issue by front ending the firewall with a router or a L3 switch. It worked pretty well for our environment.
One other thing to note is the firewall bandwidth limit of the PA-500 is 250Mbps.
Hope this helps.
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