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Switchover NetTest server parameters

A set of server parameters enables you to configure a second address to test before switching over to the backup server. If that address cannot be reached, CIC assumes that the network is down and the system does not switch to the backup server.

Switchover NetTest A specifies the name or IP address of a computer on the same network segment as SwitchoverServer B. The Switchover system on SwitchoverServer A uses the computer name or IP address when SwitchoverServer A is the backup server.

Whenever a failure condition is detected, the Switchover system on the backup server attempts to ping (ICMP echo) the IP endpoint found on the same network segment as the active server. If the Switchover system cannot ping this endpoint, it assumes that the active server is still operable and it does not cause a switchover.

Important!
Since the Switchover system no longer has a network connection, and thus cannot replicate changes, it logs an error to the event log and shuts down processing. To restart switchover monitoring and replication, you must restart the backup server.

To determine the value for Switchover NetTest A, choose the closest pingable (ICMP echo) IP address to SwitchoverServer B from SwitchoverServer A.
Switchover NetTest B specifies the name or IP address of a computer on the same network segment as SwitchoverServer A. The Switchover system on SwitchoverServer B uses the computer name or IP address when SwitchoverServer B is the backup server.

To determine the value for Switchover NetTest B, choose the closest pingable (ICMP echo) IP address to SwitchoverServer A from SwitchoverServer B.
Switchover NetTest Timeout specifies the amount of time in seconds that the Switchover system waits for the ICMP echo to return. By default, this value is one second. Switchover NetTest Timeout is used with the Switchover NetTest A and Switchover NetTest B server parameters.

For example, when SwitchoverServer A is the backup server, it uses the Switchover NetTest A server parameter to test WAN connectivity.

Time	Message
`15:52:05.437_0755`	`ServiceParameters::GetParametersFromRegistry: NetTest Server 1=135.89.3.43`
`15:52:05.437_0756`	`ServiceParameters::GetParametersFromRegistry: NetTest Server 2=86.45.2.1`
`15:52:05.437_0757`	`ServiceParameters::GetParametersFromRegistry: NetTest Server Address=135.89.3.43`

When SwitchoverServer B is the backup server, it uses the Switchover NetTest B server parameter to test WAN connectivity.

Time	Message
`15:41:45.961_0548`	`ServiceParameters::GetParametersFromRegistry: NetTest Server 1=135.89.3.43`
`15:41:45.961_0549`	`ServiceParameters::GetParametersFromRegistry: NetTest Server 2=86.45.2.1`
`15:41:45.961_0550`	`ServiceParameters::GetParametersFromRegistry: NetTest Address=86.45.2.1`

To determine the value for Switchover NetTest A, choose the closest pingable (ICMP echo) IP address to SwitchoverServer B from SwitchoverServer A. To determine the value for Switchover NetTest B, choose the closest pingable (ICMP echo) IP address to SwitchoverServer A from SwitchoverServer B. The following figure illustrates this configuration.