25

Device HA

Use device HA to increase network reliability. Device HA lets a backup ZyWALL (B) automatically take over if a master ZyWALL (A) fails.

Figure 24 Device HA Backup Taking Over for the Master

A

B

25.1 Device HA Overview

Active-Passive Mode and Legacy Mode

Active-passive mode lets a backup ZyWALL take over if the master ZyWALL fails.

Legacy mode uses VRRP (Virtual Router Redundancy Protocol) groups and allows for more complex relationships between the master and backup ZyWALLs, such as active-active or using different ZyWALLs as the master ZyWALL for individual interfaces. Legacy mode configuration involves a greater degree of complexity. Active-passive mode is recommended for general failover deployments.

The ZyWALLs must all support and be set to use the same device HA mode (either active-passive or legacy).

Management Access

You can configure a separate management IP address for each interface. You can use it to access the ZyWALL for management whether the ZyWALL is the master or a backup. The management IP address should be in the same subnet as the interface IP address.

Synchronization

Use synchronization to have a backup ZyWALL copy the master ZyWALL’s configuration, signatures (anti-virus, IDP/application patrol, and system protect), and certificates.

Note: Only ZyWALLs of the same model and firmware version can synchronize.

 

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ZyWALL (ZLD) CLI Reference Guide