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| Part No: | FE02-SSC-5889 |
| Manufacturer No: | 02-SSC-5889 |
| Delivery: | In Stock: 1-3 Days |
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Stateful High Availability (SHA) provides dramatically improved failover performance. The Primary and Backup appliances are continuously synchronized so that the Backup can seamlessly assume all network responsibilities if the Primary appliance fails, with no interruptions to existing network connections.
Stateful High Availability is not load-balancing. It is an active-idle configuration where the Primary appliance handles all traffic. When Stateful High Availability is enabled, the Primary appliance actively communicates with the Backup to update most network connection information. As the Primary appliance creates and updates network connection information (VPN tunnels, active users, connection cache entries, etc.), it immediately informs the Backup appliance. This ensures that the Backup appliance is always ready to transition to the Active state without dropping any connections.
The synchronization traffic is throttled to ensure that it does not interfere with regular network traffic. All configuration changes are performed on the Primary appliance and automatically propagated to the Backup appliance. The High Availability pair uses the same LAN and WAN IP addresses—regardless of which appliance is currently Active.
Benefits
Improved reliability
By synchronizing most critical network connection information, Stateful High Availability prevents down time and dropped connections in case of appliance failure.
Faster failover performance
By maintaining continuous synchronization between the Primary and Backup appliances, Stateful High Availability enables the Backup appliance to take over in case of a failure with virtually no down time or loss of network connections.
Minimal impact on CPU performance
Typically less than 1% usage.
Minimal impact on bandwidth
Transmission of synchronization data is throttled so as not interfere with other data.
Stateful High Availability (SHA) provides dramatically improved failover performance. The Primary and Backup appliances are continuously synchronized so that the Backup can seamlessly assume all network responsibilities if the Primary appliance fails, with no interruptions to existing network connections.
Stateful High Availability is not load-balancing. It is an active-idle configuration where the Primary appliance handles all traffic. When Stateful High Availability is enabled, the Primary appliance actively communicates with the Backup to update most network connection information. As the Primary appliance creates and updates network connection information (VPN tunnels, active users, connection cache entries, etc.), it immediately informs the Backup appliance. This ensures that the Backup appliance is always ready to transition to the Active state without dropping any connections.
The synchronization traffic is throttled to ensure that it does not interfere with regular network traffic. All configuration changes are performed on the Primary appliance and automatically propagated to the Backup appliance. The High Availability pair uses the same LAN and WAN IP addresses—regardless of which appliance is currently Active.
Benefits
Improved reliability
By synchronizing most critical network connection information, Stateful High Availability prevents down time and dropped connections in case of appliance failure.
Faster failover performance
By maintaining continuous synchronization between the Primary and Backup appliances, Stateful High Availability enables the Backup appliance to take over in case of a failure with virtually no down time or loss of network connections.
Minimal impact on CPU performance
Typically less than 1% usage.
Minimal impact on bandwidth
Transmission of synchronization data is throttled so as not interfere with other data.
