HP SuperStack Firewall Series Manual de usuario descargar pdf (Pagina 144)

144 C

HAPTER

10: C

ONFIGURING

IGH

VAILABILITY

The primary and backup Firewalls use a “heartbeat” signal to

communicate with one another. This heartbeat is sent between the

Firewalls over the network segment connected to the LAN ports of the

two Firewalls. The interruption of this heartbeat signal triggers the

backup Firewall to take over operation from the active unit of the High

Availability pair. The time required for the backup Firewall to take over

from the active unit depends on the Heartbeat Interval and the Failover

Trigger Level.

4 Enter the Heartbeat Interval time in seconds. This interval is the amount

of time in seconds that elapses between heartbeats passed between the

two Firewalls in the High Availability pair.

5 Enter the Failover Trigger Level in terms of the number of missed

heartbeats. When the backup unit detects this number of consecutive

missed heartbeats, the backup Firewall will take over operation from the

active unit.

If, for example, the Heartbeat Interval and the Failover Trigger Level are 5

seconds and 2 missed heartbeats respectively, the backup Firewall will

take over from the primary Firewall after 10 seconds in the event of a

failure in the primary Firewall.

6 Click the Update button. Once the Firewall has been updated, a message

confirming the update will be displayed at the bottom of the browser

window. If you have modified the Enable High Availability setting, you

will need to restart the Firewall for change to take effect.

Configuring High

Availability on the

Backup Firewall

The backup Firewall should not be configured through the Web interface.

Instead, configure the backup Firewall by exporting the preferences file

from the primary unit and importing the file into the backup unit. This

method assures uniform configuration of the two Firewalls in the High

Availability pair. To do this:

1 Log into the primary Firewall. Click the Tool s button on the left side of the

browser window and then click the Configuration tab at the top of the

window. Next, click the Export button.

2 Choose a location to save the primary Firewall’s preferences file. This file

is named “3Com_firewall.exp” by default, but can be renamed. The

export process may take up to one minute.

3 Log out of the primary Firewall.

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