September 2022
Beginner
736 pages
20h 54m
English
Content preview from Cisco Data Center Fundamentals
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Chapter 3
Describing Layer 3 First-Hop Redundancy
First-hop redundancy protocols (FHRPs) consist of networking protocols that provide an active default IP gateway at all times. FHRPs use two or more routers or Layer 3 switches to transparently fail over at the first-hop IP router.
In this chapter, we will discuss the challenges presented by single default gateway configuration on end hosts, along with its solutions using Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), and Gateway Load Balancing Protocol (GLBP) as Layer 3 redundancy protocols.
Default Gateway Redundancy
The default gateway facilitates communication between hosts on different networks. The source host sends the data to its default gateway. The default ...