# Adjust general Engine clustering options

To tune the settings that relate to how the traffic load is balanced between several online nodes, adjust the Engine clustering options.

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For more details about the product and how to configure features, click Help or press F1.

## Steps

1. Select Engine
2. Right-click a Engine Cluster element and select Edit Engine Cluster.
   The Engine Editor opens.
3. In the navigation pane on the left, browse to General > Clustering.
4. Configure the settings.
   Note: Do not adjust the settings in the Advanced Cluster Settings dialog box unless you are certain it is necessary.
5. Click Save and Refresh to transfer the changes.

## Engine Editor > General > Clustering

Use this branch to view nodes and add new nodes to the Security Engine cluster.

Option | Definition
--- | ---
Node ID (Not editable) | Shows the ID number of the node.
Name | Specifies the name of the node. Double-click the cell to edit the name.
Configuration Status (Not editable) | Shows the configuration status of the node.
Certificate (Optional) | Shows information about the node's certificate for external certificate management. Right-click the cell, then select Edit Certificate to create a certificate request for the Security Engine node. You must create a separate certificate request for each Security Engine node.
Version (Not editable) | Shows the version of the Security Engine software that is installed on the engine.
Comment (Optional) | A comment for your own reference.
SNMP Location | Specifies the SNMP location string that is returned on queries to the SNMPv2-MIB or SNMPv2-MIB-sysLocation object.
SNMP Engine ID (SNMPv3 only) | A unique identifier for each Security Engine node that is used by the SNMP agent. The engine ID is used with a hash function to generate keys for authentication and encryption of SNMPv3 messages. If you do not specify the SNMP engine ID, an SNMP engine ID is automatically generated.
Disabled | Disables the node. You can enable the node later.
Add Node | Adds a node to the cluster. Opens the Engine Node Properties dialog box.
Edit Node | Allows you to change the properties of the selected node. Opens the Engine Node Properties dialog box.
Remove Node | Deletes the selected node. The deleted node cannot be restored.
Clustering Mode (Not Layer 2 Engines) | Balancing — All nodes are simultaneously online providing enhanced performance and high availability if there is node failure. Balancing mode is the default mode. Standby — Only one node can be online at a time. We recommend having at least one other node on standby to allow automatic takeover if there is failure. Several nodes can be on standby at a time. A randomly selected standby node is turned online when the online node fails. Note: Only standby clustering mode is supported for Layer 2 Engine Clusters.
Clustering | Allows you to change advanced settings for the cluster. Opens the Advanced Cluster Settings dialog box.