PLANET SG-4800 - Manual (Page 169)

Gigabit SSL VPN Security Router User’s Manual
Besides general HA, Planet also provides advanced HA function that enables two devices to operate
simultaneously. It brings full cost efficiency without making another device idle. It does not have to be the
same model. All of Planet devices which support HA can achieve the function.
Item Description
High Availability Enable: Activate HA function.
Disable: Disable HA function.
Mode (1) Hardware Backup Mode
It is the general backup mode. The master device takes responsibility of network
transmitting and the other one is set as idle. When the master device fails
transmitting, it will send out the message to the idle device for taking over network
transmitting immediately.
(2) Two devices are operating simultaneously
Two devices operate outbound linking simultaneously, but they are still separated as
Master device and Backup device. In normal situation, Master device is major DHCP
IP issuer, and Backup device will disable DHCP issuing automatically. When Master
device fails transmitting, the Backup device will take over all outbound links and
enable DHCP server to provide IP addresses.
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