Host Standby Routing Protocol (HSRP) for First Hop Redundancy Protocol (FHRP)

Configure R1 as Active Router at the Gateway Interface G0/1 to PC-A
Default priority = 100.
Use Virtual IP Address = 192.168.1.254 and Group = 1.

R1 (config) # int g0/1
R1 (config-if) # standby version 2
R1 (config-if) # standby 1 ip 192.168.1.254
R1 (config-if) # standby 1 priority 150
R1 (config-if) # standby 1 prempt


Configure R2 as Standby Router at the Gateway Interface G0/1 to PC-B
Default priority = 100.
Use Virtual IP Address = 192.168.1.254 and Group = 1.

R2 (config) # int g0/1
R2 (config-if) # standby version 2
R2 (config-if) # standby 1 ip 192.168.1.254


R2 (config-if) # do show standby brief

Note: Remember to use virtual IP address as default gateway address for PC-A and PC-B.
Likewise do the same for switches, if used in the same LAN.