SonicWALL E6500 Manuel d'utilisateur télécharger pdf (Page 35)

Page 34 Configuring a State Sync Pair in NAT/Route Mode

failovers, especially when the SonicWALL is under a heavy

load.

6. Set the Probe Level for the interval in seconds between

communication with upstream or downstream systems.

SonicWALL recommends that you set the interval for at

least 5 seconds. You can set the Probe IP Address(es) on

the High Availability > Monitoring screen.

7. Typically, SonicWALL recommends leaving the Failover

Trigger Level (missed heart beats), Election Delay Time

(seconds), and Dynamic Route Hold-Down Time fields

to their default settings. These fields can be tuned later as

necessary for your specific network environment.

-The Failover Trigger Level sets the number of

heartbeats that can be missed before failing over.

-The Election Delay Time is the number of seconds

allowed for internal processing between the two units in

the HA pair before one of them takes the primary role.

-The Dynamic Route Hold-Down Time setting is used

when a failover occurs on a HA pair that is using either

RIP or OSPF dynamic routing. When a failover occurs,

Dynamic Route Hold-Down Time is the number of

seconds the newly-active appliance keeps the dynamic

routes it had previously learned in its route table.

During this time, the newly-active appliance relearns

the dynamic routes in the network. When the Dynamic

Route Hold-Down Time duration expires, it deletes the

old routes and implements the new routes it has

learned from RIP or OSPF. The default value is

45 seconds. In large or complex networks, a larger

value may improve network stability during a failover.

8. Click the Include Certificates/Keys checkbox to have the

appliances synchronize all certificates and keys.

9. Click Synchronize Settings to synchronize the settings

between the Primary and Backup appliances.

10. Click Synchronize Firmware if you previously uploaded

new firmware to your Primary unit while the Secondary unit

was offline, and it is now online and ready to upgrade to the

new firmware. Synchronize Firmware is typically used

after taking your Secondary appliance offline while you test

a new firmware version on the Primary unit before

upgrading both units to it.

11. Click Apply to retain the settings on this screen.

NSA_E6500_GSG.book Page 34 Wednesday, June 17, 2009 7:16 PM

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SonicWALL E6500 Manuel d'utilisateur Page 35

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