In HSRP FAQ:
Q. What is the difference between GLBP and HSRP?
With HSRP in a single router (gateway), one interface is used as the active interface and the other interface is in standby. The active interface is used for all the traffic and the standby interface just waits for the active interface to fail without any traffic.
What does it means can we use single router connected to two L2 switches thro FA ports (config as HSRP one active and standby interface)