1 GSLB optimization
Client LDNS 2.1.1.53 sends a DNS request to GSLB ServerIron ADX for www.foo.com. GSLB ServerIron ADX rearranges the DNS reply as follows.
1.It checks if there is any affinity definition associated with the client LDNS network. In this example, it finds that there is a definition associating network 2.1.1.0/24 with ServerIron ADX 2.1.1.104. So it checks if there is any IP address in the reply which is a VIP configured on ServerIron ADX 2.1.1.104 and is in the active (A) state on that ServerIron ADX.
2.Since it does not find any such VIP, it then checks if ServerIron ADX 2.1.1.104 is a part of GSLB HA group. In this example, it is a part of a HA group and its HA peer is ServerIron ADX 2.1.1.103.
3.It then checks if there is any IP address in the reply that is a VIP on 2.1.1.103. It finds IP address 2.1.1.23 in the DNS reply that is a VIP in the active (A) state on ServerIron ADX 2.1.1.103 and selects this as the best IP address for client LDNS 2.1.1.53.
GSLB optimization
A site ServerIron ADX sends a list of GSLB enabled VIPs to the GSLB controller on a periodic basis. If distributed health checks is enabled on the site ServerIron ADX, then this list would also include the health status of the VIP ports.
The following two procedures are used to optimize GSLB processes:
•“Optimized VIP list processing” on page 162.)
•“Increased VIP support per site and reduced CPU usage on GSLB controller” on page 162)
Optimized VIP list processing
The GSLB controller can optionally be enabled to process the VIPlist from the controller in a more optimal manner. This mechanism reduces CPU usage on controller.
The feature can be enabled by issuing following command at the global config level.
ServerIronADX(config)# gslb
Syntax: [no] gslb process-vip-list-optimize
NOTE
This command requires a reload to take effect.
Increased VIP support per site and reduced CPU usage on GSLB controller
Through use of the VIP List Optimize feature the maximum number of
Use the following commands on controller and site to avail this functionality.
162 | ServerIron ADX Global Server Load Balancing Guide |
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