Chapter 35 Device HA
ZyWALL USG Series User’s Guide
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35.3 Device HA Pro
You need a license to use Device HA Pro. Device HA Pro is easier to deploy than Device HA, is more
reliable (no risk of overloading), and faster (Device HA causes a connection break of 10~30 seconds
while Device HA Pro just has 1~2 seconds). In addition to configuration file backup in Device HA, device
time, TCP sessions (IPv4/IPv6), IPSec VPN sessions, login/logout information, DHCP table, IP/MAC binding
table and license status can also be backed up using Device HA Pro.
Active and Passive Devices
Device HA Pro uses a dedicated heartbeat link between an active device (‘master’) and a passive
device (‘backup’) for status syncing and backup to the passive device. On the passive device, all ports
are disabled except for the port with the heartbeat link.
In the following example, Zyxel Device
A
is the active device that is connected to passive device Zyxel
Device
B
via a dedicated link that is used for heartbeat control, configuration synchronization and
troubleshooting. All links on Zyxel Device
B
are down except for the dedicated heartbeat link.
Note: The dedicated heartbeat link port must be the highest-numbered port on each
Zyxel
Device
for Device HA Pro to work.
Figure 447
Device HA Pro
Failover from the active Zyxel Device to the passive Zyxel Device is activated when:
• A monitored interface is down
• A monitored service (daemon) is down
• The heartbeat link exceeds the failure tolerance.
Service Status
This field displays whether a service license is enabled at myZyxel (
Activated
) or not
(
Not Activated
)
or expired (
Expired
). It displays the remaining Grace Period if your
license has
Expired
. It displays
Not Licensed
if there isn’t a license to be activated for
this service.
If you need a license or a trial license has expired, click
Buy
to buy a new one. If a
Standard
license has expired, click
Renew
to extend the license.
Then, click
Activate
to connect with the myZyxel server to activate the new license.
Apply
Click
Apply
to save your changes back to the Zyxel Device.
Reset
Click
Reset
to return the screen to its last-saved settings.
Table 294 Configuration > Device HA > Device HA Status (continued)
LABEL
DESCRIPTION