9.3.3-packet-tracer---hsrp-configuration-guide

/* R1 */
en
conf t
int g0/1
standby version 2
standby 1 ip 192.168.1.254
standby 1 priority 150
standby 1 preempt

/* R3 */
en
conf t
int g0/0
standby version 2
standby 1 ip 192.168.1.254

/* S1 and S2 */
en
conf t
ip default-gateway 192.168.1.254

/* configure manually the default gateway on the PCs */