Overview

Global Server Load Balancing (GSLB) is the method of load balancing applications/workloads that are distributed globally (typically, multiple data centers and public clouds). GSLB enables the efficient distribution of traffic across geographically dispersed application servers. 

In a production environment, the corporate name server delegates one or more subdomains to Avi Load Balancer GSLB, which then owns these domains and responds to DNS queries from clients. DNS-based load balancing is implemented by creating a DNS Virtual Service. 

How GSLB Works?

Let’s understand the working of GSLB using the example. 

2 SDDCs are running in VMC, and both SDDC has local load balancing configured to load balance set of web servers in their respective SDDC. The 2 Virtual Services (SDDC01-Web-VS & SDDC02-Web-VS) have a couple of web servers as pool members and the VIP of the Virtual Service is translating to Public IP via NAT.  

Let’s assume the 4 web servers running across 2 SDDC are servicing the same web application and you are looking for doing a global load balancing along with local load balancing. … Read the rest