You can get the max number of arp entries supported on a platform using the following command:
show system state filter cfg.general.max*
Here is a sample output for 200:
admin@lab108-PA-200(active)> show system state filter cfg.general.max*
You can also get this value from:
admin@lab108-PA-200(active)> show arp all
maximum of entries supported : 500
default timeout: 1800 seconds
total ARP entries in table : 25
total ARP entries shown : 25
status: s - static, c - complete, e - expiring, i - incomplete
You can also look at specsheets PDFs on PaloAlo home website, like this one: http://media.paloaltonetworks.com/documents/PA500_Specsheet.pdf
This is a very good limitation to know: MAC table size/device: 500 for PA-500
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