Why implement VRRP?

VRRP does not provide autodiscovery of virtual gateways to end users; it provides a fixed virtual gateway IP that end users are statically configured to use or obtain via DHCP.

VRRP is a First Hop Redundancy Protocol (FHRP) designed to provide default gateway redundancy for end users; it allows multiple routers to act as a single virtual router, sharing a virtual IP and MAC address, and being an open standard, it is suitable for multivendor networks.

While VRRP contributes to uninterrupted service, it uses a priority scheme for active/standby election, not a weighting scheme in the same way some other protocols might use to influence traffic paths or load balancing.

VRRP itself has its own robust failure detection mechanisms and is not primarily implemented to avoid the overhead of BFD; BFD can be integrated with VRRP for faster detection, but VRRP is not a replacement for BFD.