DG-LB1054UV User Manual
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3.2.4 Redundancy
3.2.4.1 VRRP
The Virtual Router Redundancy Protocol (VRRP) is a computer networking protocol
providing device redundancy. It allows a backup router or switch to automatically take over
if the primary (master) router or switch fails. This increases the availability and reliability of
routing paths via automatic default gateway selections on an IP network.
The protocol achieves this by creation of virtual routers, which are an abstract representation
of multiple routers, i.e. master and backup routers, acting as a group. The default gateway of
a participating host is assigned to the virtual router instead of a physical router. If the physical
router that is routing packets on behalf of the virtual router fails, another physical router is
selected to automatically replace it. The physical router that is forwarding packets at any
given time is called the master router.
