VRRP: Increasing Reliability and Failover with the Virtual Router Redundance Protocol

2.2. Basic Concepts and Configurations

Now that we have a context for the relevance of VRRP as well as the specific problem it is designed to solve, let us look at some basic elements VRRP uses to create the required redundancy or switchover mechanism. To do that, we revisit the LAN of the branch office discussed in Figure 2-2. On this LAN N1 network resides a series of hosts—H1, H2, H3, and H4—and two routers—R1 and R2—both positioned as potential first hop routers. As depicted in Figure 2-3, we assign R1 as the default router to all the hosts on N1 network.

Figure 2-3. Single default router

This configuration requires that any message originating ...