ZyWALL USG Series User’s Guide
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CHAPTER 42
Device HA
42.1 Device HA Overview
Device HA lets a backup (or passive) Zyxel Device (B) automatically take over if the master (or active)
Zyxel Device (A) fails.
Figure 535 Device HA Backup Taking Over for the Master
42.1.1 Device HA and Device HA Pro Differences
The following table displays the feature differences between Device HA and Device HA Pro.
Note: See Section 1.1 on page 28 to see which models support Device HA and Device HA
Pro.
Table 286 Device HA Vs Device HA Pro
FEATURE DEVICE HA DEVICE HA PRO
License None required. Need a license.
Role Role of Master and Backup is
configurable. Master takes over
from Backup if the Master goes
down and then becomes the
Master again if it comes back
online again (failback).
Role of active and passive is not configurable. The active
model is the one whose heartbeat interface comes online
first. The passive becomes active if active goes down and
stays active even if the previous active comes online again.
Firmware
Upgrade
Master remains Master by default
when new firmware is uploaded.
If Device HA Pro is enabled, then both the active and
passive Zyxel Device must be online and connected in
order to upload firmware. New firmware is first uploaded to
the passive device and then uploaded to the active
device. By default, the passive device reboots after
firmware upload making it become the active device.
Don’t select the Reboot prompt after uploading firmware to
the passive device if you want the passive device to remain
passive when new firmware is uploaded. Alternatively,
disable Device HA Pro if you want to just upload firmware to
the active Zyxel Device.
What is
synchronized
Configuration file Configuration file, device time, IPv4/v6 TCP sessions, IPSec
VPN tunnels, user login/logout information, AV/IDP
signatures, DHCP table, IP/MAC binding table.
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