# Routes to Fault-Tolerant Servers

You can configure servers for fault tolerance. Client applications can specify the primary and secondary servers.

Once a client has connected to the active server, if its connection to the server fails, the client can connect to the standby server and resume operation. Similarly, a route specification can specify primary and secondary passive servers, so that if the route to the active-state server fails, the active-route server can connect to the standby-state server and resume routing.

Failover behavior for route connections is similar to that for client connections; see Configure Clients for Shared State Failover Connections.

## Example

    create route B url=tcp://B:7454,tcp://BBackup:7454 zone_name=Z1 zone_type=1hop

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