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4.6.9 VRRP
The Virtual Router Redundancy Protocol (VRRP) is designed to eliminate the single point of failure inherent in the static default
routed environment. VRRP specifies an election protocol that dynamically assigns responsibility for a virtual router to one of the
VRRP routers on a LAN. The VRRP router controlling the IP address(es) associated with a virtual router is called the Master,
and forwards packets sent to these IP addresses. The election process provides dynamic fail-over in the forwarding
responsibility should the Master become unavailable. Any of the virtual router's IP addresses on a LAN can then be used as
the default first hop router by end-hosts. The advantage gained from using VRRP is a higher availability default path without
requiring configuration of dynamic routing or router discovery protocols on every end-host.
The feature of VRRP protocol:
IP Address Backup
•
Virtual IP for Default Gateway
–
Multiple Virtual Routers for Load Balancing
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Elect Best Path
•
According to Priority and IP Address
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Efficient Operation
•
No More Packet Besides ADVERTISEMENT
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No State Transition is Triggered by Any Backup Router of Equal or Lower Priority
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