Load Balancing Elements - Avaya P330 User Manual

Chapter 1

Load Balancing Elements

There are several abstract load balancing elements:
Traffic from the WAN is directed to the Virtual Server. The Virtual Server
provides Virtual Services when transferring packets to the RSG, which is
comprised of RSs. The following figure illustrates the conceptual load
balancing model.
3
• Real Server (RS) - An RS is a physical server that is associated
with a Real IP address. One or more RSs may belong to an RSG.
• Real Server Group (RSG) - An RSG is a logical grouping of Real
Servers used for load balancing. For example, for SLB, the load
balancer distributes packets to Real Servers belonging to a specific
RSG.
• Virtual Service - Virtual Services are abstract links to the RSGs
provided by a Virtual Server. For example, load-balanced
forwarding of HTTP or FTP packets is a Virtual Service.
• Virtual Server - A Virtual Server represents the server to the
outside world. It is associated with a Virtual IP address and
provides Virtual Services. For example, a load balancer that
intercepts traffic from the WAN acts as a Virtual Server.
Figure 1-1. The Conceptual Load Balancing Model
Virtual
Service
RSG
Real
Server
Virtual Virtual
Server Server
Virtual Virtual
Service Service
RSG RSG
Real
Server
Avaya P330 Load Balancing Manager User Guide
Real
Server