arp/mac cache limits - any plans to increase them?

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arp/mac cache limits - any plans to increase them?

L4 Transporter

Palo Alto seem to have the lowest arp/mac cache limits of any firewall I've ever come across.

Are there any plans to increase the limits please?


L4 Transporter

Out of curiosity, what are the limits and how do you know if you approach them, etc.



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*
cfg.general.max-address: 0x9c4

cfg.general.max-address-group: 0xfa

cfg.general.max-address-per-group: 0x1f4

cfg.general.max-appinfo2ip-entry: 500

cfg.general.max-arp: 0x1f4

cfg.general.max-blacklist: 0x61a8

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:

This is a very good limitation to know:  MAC table size/device: 500  for PA-500

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