In today’s modern network implementations DHCP is the preferred choice of assigning hosts an IP address and setting the gateway for which they send all traffic to.  What if the gateway they send  traffic to blows up, or fails in some way and no longer forwards traffic from the hosts on the network, to other outside subnets or even the internet?

Enter the First Hop Redundancy Protocols (FHRPs) Hot Standby Router Protocol, (HSRP), Virtual Router Redundancy Protocol (VRRP), and Gateway Load Balancing Protocol (GLBP) are the three flavors of FHRPs you can use to ensure redundant and transparent gateway connectivity for hosts on your network in the event  the primary gateway router goes down.


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