HA Active/Passive MAC address

L2 Linker

HA Active/Passive MAC address

Hello - In PaloAlto 5220 appliance configured in Active/Passive mode, both the Firewalls do have the same MAC address on interfaces. For example ETH 1/1 of active and standby Firewall have the same MAC address after cluster/HA was created.


These the switchport connecting the StandbyFirewall doesnt learn the MAC address of the Paloalto interface. 


From switch what is the way to know the MAC and ARP of the secondary firewall interface?



L7 Applicator

Re: HA Active/Passive MAC address

The MAC address is the same, as you've noted. The switch will learn of the passive only if a failover happens, at which point the (formerly passive) firewall will send a gratuitous ARP which will tell the switch to forward packets on the new port even though the IP and MAC are the same.



L4 Transporter

Re: HA Active/Passive MAC address

One thing to note as it's sort of relevant...


Never copy your HA Config  to another firewall on your network without removing all the HA configuration. Otherwise bad things happen!





L2 Linker

Re: HA Active/Passive MAC address

Thanks for letting us know

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