The Palo Alto instructions to set up High Availability are fairly straightforward, but the devices upstream and downstream barely get a mention. In our case, downstream we have two Cisco switches and multiple VMs attached. Upstream are two Cisco switches to a larger network.
We are considering link-state tracking on the Cisco switches to create the redundancy for the Palo Alto's to failover. Any suggestions or tips?
Since you have dual switches on both sides you are in a good position for reliability in hardware failure modes.
You do need to be sure that your PA tracking will force the failover if EITHER the upstream OR downstream switch fails.
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