This chapter describes the high availability (HA) configuration of ILB by using the VRRP feature. The ILB is configured for high availability by using the DSR and half-NAT topologies. The half-NAT and DSR topologies use the VRRP to protect the virtual IP address of an ILB rule. However, in half-NAT topology, the VRRP is also used to protect the IP address of the primary load balancer that is facing the back end servers. This helps to make sure that when the primary load balancer fails, the back end servers switch to use the standby (passive) load balancer.
For more information about VRRP, see Chapter 3, Using Virtual Router Redundancy Protocol and for more information about how to configure and manage ILB, see Chapter 6, Configuring and Managing the Integrated Load Balancer.
This chapter contains the following topics:
Configuring ILB for High Availability By Using the DSR Topology
Configuring ILB for High Availability By Using the Half-NAT Topology