HA Active/Passive with Preemption

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HA Active/Passive with Preemption

L2 Linker

2 firewalls configured with HA active/passive, And enabled preempt on both of firewalls

Everythings find, can synchronize configuration and session


firewall-A is active-firewall with priority 100

firewall-B is passive-firewall with priority 120

HA timer settings is recommended


But when I was testing for HA switch over by unplugged a interface on Active firewall (firewall-A), firewall-A moves into passive state, then active state again then passive state finally moves into "Preempt loop detected",


Actually I know that it will switchover 3 times after change firewall-A to suspend state


Is that a normal situation? Why does firewall-A still need to preempt itself as a active firewall even I did not put cable back (port still down)?



L6 Presenter

Have you checked everything in this article by Palo Alto for such issues?



L2 Linker

Hi, I found a new useful ref:



Seem when we choose shutdown mode, it will cause a preemt loop, solved by choose auto mode instead

but for layer2 environment should keep shutdown mode and disable preempt option

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