What is the expected DataGuard behavior in the following scenario?

We were testing automatic failover of the DBs here are the steps performed/followed:

» Backup both DBs

» Turn off the network interface on primary DB db01

» Failover – automatic switch

» Standby DB db02 was configured as new primary

» Turn on the network interface on old primary DB db01

» The DB db01 was shut down, I started as: startup mount standby

» The DB db01 was configured as new standby automatically and both DBs were synchronized

» Perform switchover to roll back the changes: db01 – primary & db02 – standby

The problem here is that when the switchover occurs the new standby db01 is in a shutdown state instead as coming up automatically in mounted state.