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Software Secure Firewall Threat Defense
Platform Secure Firewall Threat Defense Virtual
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Device Operations Clustering for the Firepower 4100/9300 Firewall Management Center : Manage Cluster Members Add a New Cluster Member

Last updated: Jul 29, 2025

Add a New Cluster Member

When you add a new cluster member in FXOS, the Secure Firewall Management Center adds the member automatically.

Before you begin

  • Make sure the interface configuration is the same on the replacement unit as for the other chassis.

Procedure

1

Add the new unit to the cluster in FXOS. See the FXOS configuration guide.

Wait for the new unit to be added to the cluster. Refer to the Firewall Chassis ManagerLogical Devices screen or use the Firewall Threat Defense show cluster info command to view cluster status.
2

The new cluster member is added automatically. To monitor the registration of the replacement unit, view the following:

  • Cluster Status dialog box (which is available from the Devices > Device Management More (more icon) icon or from the Devices > Device Management > Cluster tab > General area > Cluster Live Status link)—A unit that is joining the cluster on the chassis shows "Joining cluster..." After it joins the cluster, the Firewall Management Center attempts to register it, and the status changes to "Available for Registration". After it completes registration, the status changes to "In Sync." If the registration fails, the unit will stay at "Available for Registration". In this case, force a re-registration by clicking Reconcile.

  • System status > Tasks —The Firewall Management Center shows all registration events and failures.

  • Devices > Device Management—When you expand the cluster on the devices listing page, you can see when a unit is registering when it has the loading icon to the left.
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