HSRP ( HOT STANDBY ROUTER PROTOCOL)

HSRP  is a cisco proprietary protcol , VRRP (Virtual Redundancy Router Protocol) is the open standard used for redundancy RFC 3768.

HSRP process have 6 states .

1. Initial

  This will happens in only two time , once the config change done and after router reboot.

2. Learn

3. Listen

4. Speak

5.Stand by

6. Active 

Config :

R1(config-if)# standby 100 ip 192.168.100.1
R1(config-if)# standby 100 priority 100
R1(config-if)# standby 100 track fa 0/0/1     /* This will track the interface , if its down decrement the priority  *|
R1(config-if)# standby 100 preempt    /* This will ensure highest priority router is the active one. *\