|  Chapter Goals In this Chapter, you will learn how to configure Global Server Load Balancing (GSLB). The Chapter is divided into the following sections: |
In this Chapter, you will learn how to resolve issues relating to disaster recovery, name resolution response times increases, and data center capacity increases. By mirroring your content across geographically distributed data centers and enabling the Global Server Load Balancing (GSLB) intelligent request routing capabilities discussed in this Chapter, you can resolve many present and future redundancy, response time, and scalability issues. You will learn about the following GSLB technologies in this Chapter: DNS Round-Robin Distributes requests across sites using round-robin with DNS servers only[md]no GSLB devices are required. BGP anycast Advertises the site prefix from multiple locations into BGP; routers automatically distribute requests to the prefix based on BGP attributes, such as AS path. DNS GSLB Distributes requests based on various metrics, such as proximity, and stickiness, across sites using GSLB devices enabled with DNS capabilities. HTTP Redirection Distributes client requests across sites using the HTTP 301 Moved redirection method. Route Health Injection Advertises host routes for healthy VIPs into the routing table, and routers select the VIP with the best routing metric for client requests.
You can enable one or more of these technologies in your network to achieve GSLB. |