Table of Contents
End-of-Life (EoL)

HA Clustering

Configure HA clustering on up to 16 firewalls to protect against failure of data center communications or to achieve horizontal scaling.
A number of Palo Alto Networks
firewall models now support session state synchronization among firewalls in a high availability (HA) cluster of up to 16 firewalls. The HA cluster peers synchronize sessions to protect against failure of the data center or a large security inspection point with horizontally scaled firewalls. In the case of a network outage or a firewall going down, the sessions fail over to a different firewall in the cluster.
HA clusters support a Layer 3 or virtual wire deployment. HA peers in the cluster can be a combination of HA pairs and standalone cluster members. All cluster members share session state. When a new firewall joins an HA cluster, that triggers all firewalls in the cluster to synchronize all existing sessions. The new, required HA4 and HA4 backup connections are the dedicated cluster links that synchronize session state among all cluster members having the same cluster ID. The HA4 link between cluster members detects connectivity failures between cluster members.
The firewall models that support HA clustering and the maximum number of members supported per cluster are as follows:
Firewall Model
Number of Members Supported Per Cluster
PA-3200 Series
PA-5200 Series
PA-7000 Series firewalls that have at least one of the following cards: PA-7000-100G-NPC, PA-7000-20GQXM-NPC, PA-7000-20GXM-NPC
PA-7080: 4
PA-7050: 6
Follow the HA Clustering Best Practices and Provisioning requirements to ensure compatibility and consistent security enforcement, for example.
  1. Configure two HA interfaces (to assign as the HA4 and HA4 backup links).
  2. Enable HA clustering.
    1. Select
      High Availability
      and edit the Clustering Settings.
    2. Enable Cluster Participation
    3. Enter the
      Cluster ID
      and configure the Clustering Settings.
  3. Configure the HA4 link.
    1. Select
      HA Communications
      and in the Clustering Links section, edit the HA4 section.
    2. Select the interface you configured as an
      interface to be the
      for the HA4 link; for example, ethernet1/1.
    3. Enter the
      IPv4/IPv6 Address
      of the local HA4 interface.
    4. Enter the
  4. Configure the HA4 Backup link by editing the HA4 Backup section in a similar manner.
  5. Specify all members of the HA cluster, including the local member and both HA peers in any HA pair.
    1. Select
      Cluster Config
    2. Add
      a peer member’s
      Device Serial Number
    3. Select the device and
  6. Define HA failover conditions with link and path monitoring.
  7. Commit
  8. Select
    to view HA cluster information in the web interface.

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