Thank you for your replies.
Just can't figure out how to auto route office network to recovery site when failover happens. (Actually prod site is fine just no connection with office so we will put some script on prod-site if connection lost with office, so it starts failover to recovery site. It works in my case.)
The problem is: route all office connection to recovery site automatically and when prod-site active again route back the office connection to prod-site again.
If anyone has experience something like this, Please share!
Thank you.