In a HSRP setup when Active Fails and Standby takes over how does the end host knows that it's path has been changed?

Difference between show processes memory and show processes memory platform

After making changes in the PBR ,I have to reload the Router to make the PBR work correctly. I need the command that needs to be executed after the policy, route-map or prefix-list of a PBR configuration has changed.  The command is something akin to...