Use Case: Configure Active/Active HA with ARP Load-Sharing

In this example, hosts in a Layer 3 deployment need gateway services from the HA firewalls. The firewalls are configured with a single shared IP address, which allows ARP Load-Sharing. The end hosts are configured with the same gateway, which is the shared IP address of the HA firewalls.

Perform Step 1 through Step 15 of Configure Active/Active HA.
Configure an HA virtual address.
The virtual address is the shared IP address that allows ARP Load-Sharing.
Select
Device
High Availability
Active/Active Config
Virtual Address
and click
Add
.
Enter or select an
Interface
.
Select the
IPv4
or
IPv6
tab and click
Add
.
Enter an
IPv4 Address
or
IPv6 Address
.
For
Type
, select
ARP Load Sharing
, which allows both peers to use the virtual IP address for ARP Load-Sharing.
Configure ARP Load-Sharing.
The device selection algorithm determines which HA firewall responds to the ARP requests to provide load sharing.
For
Device Selection Algorithm
, select one of the following:
IP Modulo
—The firewall that will respond to ARP requests is based on the parity of the ARP requester's IP address.
IP Hash
—The firewall that will respond to ARP requests is based on a hash of the ARP requester's IP address.
Click
OK
.
Enable jumbo frames on firewalls other than PA-7000 Series firewalls.
Define HA Failover Conditions
Commit
the configuration.
Configure the peer firewall in the same way, except selecting a different Device ID.
For example, if you selected Device ID
0
for the first firewall, select Device ID
1
for the peer firewall.