HSRP and VRRP Hello Package
Posted on June 19th, 2009 by hengdu
I am always interesting in how protocol communicated. That’s why I will leave a note in here for HSRP and VRRP.
HSRP is Cisco propertary. The Hello Package between active router and standby router is sent to 224.0.0.2 UDP port 1985. (Do you remember the movie Back to the Future?)
VRRP is open standard. They use their own protocol to transport Hello package to 224.0.0.18. The protocol number is 112.
GLBP members communicate each other every 3 seconds by sending hello message to 224.0.0.102 UDP port 3222 (both source and destination).
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