Which FHRP(First Hop Redundancy Protocol) supports multiple active forwarding gateways per group?
- HSRP (Hot Standby Router Protocol)
- VRRP (Virtual Router Redundancy Protocol)
- GLBP (Gateway Load Balancing Protocol)
The correct answer is 3.
Unlike HSRP and VRRP, GLBP can have multiple routers forwarding traffic for a single virtual IP address. It achieves this by using multiple virtual MAC addresses for a single virtual address. A single router is still in control of the virtual IP address and answers ARP requests for that IP address. This router effectively balances the load over the different forwarding routers.