FIGURE 34 Router 1 is the Host1 default gateway but is a single point of failure
Router 1 is the host default gateway out of the subnet. If this interface goes down, Host1 is cut o from the rest of the network. Router 1
is thus a single point of failure for Host1’s access to other networks.
If Router 1 fails, you could congure Host1 to use Router 2. Conguring one host with a dierent default gateway might not require too
much extra administration. However, consider a more realistic network with dozens or even hundreds of hosts per subnet; reconguring
the default gateways for all the hosts is impractical. It is much simpler to congure a VRRP virtual router on Router 1 and Router 2 to
provide a redundant path for the hosts.
The examples show the same sample networks, but a VRRP virtual router is congured on Router 1 and Router 2 in the second
example.
VRRP and VRRP-E overview
FastIron Ethernet Switch Layer 3 Routing
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