Main Server breakdown
The Standby Server deems the Main Server to be broken down in the following cases:
• Main Server core services not running (state: “Not running”);
• Main Server base services not running (state: “No connection”);
• No IP connectivity to the Main Server (state: “No connection”).
To detect those breakdown conditions the Standby Server periodically pings the Main Server. If the ping-reply either equals to state “Not running” or state “No connection” the Standby Server will do the following depending on its type:
• nothing in case it is configured as Cold Standby Server;
• start up its core services in case it is configured as Warm Standby Server.
If the Main Server breaks down, any FOXMAN-UN client (local or remote client) connected to it will lose its connection. Thus, the operator becomes aware that there is a problem with the Main Server. Now they can connect to the Standby Server to continue managing the network. In case the Standby Server is of type “Cold Standby Server” they afore need to start up the core services on the latter manually.