GLBP

GLBP, or Gateway Load Balancing Protocol, is a Cisco proprietary protocol that goes beyond simple redundancy by also distributing traffic across multiple routers simultaneously. Unlike HSRP and VRRP, where only one router actively handles traffic at a time, GLBP allows all routers in the group to forward traffic, improving both availability and bandwidth utilization. Each router in the group shares the same virtual IP address but is assigned a different virtual MAC address, allowing traffic to be load-balanced across all active gateways.