Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 5)

ServerIron ADX Global Server Load Balancing Guide v
53-1002437-01
DNSSEC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
Verification with DIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
DNSSEC GSLB in DNS proxy mode . . . . . . . . . . . . . . . . . . . . . .114
Configuring DNSSEC for GSLB . . . . . . . . . . . . . . . . . . . . . . . . .115
Displaying DNSSEC configuration. . . . . . . . . . . . . . . . . . . . . . .116
Displaying DNSSEC statistics . . . . . . . . . . . . . . . . . . . . . . . . . .116
Host-level policies for site selection. . . . . . . . . . . . . . . . . . . . . . . . .117
Global vs host-level policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117
Configuring host-level policies . . . . . . . . . . . . . . . . . . . . . . . . .117
Displaying host-level policy information . . . . . . . . . . . . . . . . . .125
Deleting GSLB host-level policies . . . . . . . . . . . . . . . . . . . . . . .128
Configuration example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128
Geographic region for a prefix . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
How geographic location is determined . . . . . . . . . . . . . . . . . .129
Configuring a geographic prefix . . . . . . . . . . . . . . . . . . . . . . . .130
Displaying the number of geographic prefixes. . . . . . . . . . . . .131
Displaying information about geographic prefix . . . . . . . . . . .131
Example configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
Smoothing mechanism for RTT measurements . . . . . . . . . . . . . . .133
Configuring enhanced RTT smoothing . . . . . . . . . . . . . . . . . . .134
Determining if the new RTT smoothing mechanism is enabled141
Round-trip times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Passive RTT gathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Active RTT gathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
Support for both active and passive RTT . . . . . . . . . . . . . . . . .143
Active RTT gathering issues and trade-offs . . . . . . . . . . . . . . .144
Enabling active RTT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
Discarding passive RTT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Disabling passive RTT gathering. . . . . . . . . . . . . . . . . . . . . . . .145
Configuring active RTT parameters. . . . . . . . . . . . . . . . . . . . . .146
Probes for RTT gathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Active RTT gathering and high availability support . . . . . . . . .151
Displaying RTT information . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
GSLB affinity for high availability . . . . . . . . . . . . . . . . . . . . . . . . . . .157
Configuring an HA group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
Enabling dynamic detection . . . . . . . . . . . . . . . . . . . . . . . . . . .158
Displaying HA information . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159
GSLB optimization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162
Optimized VIP list processing . . . . . . . . . . . . . . . . . . . . . . . . . .162
Increased VIP support per site and reduced CPU usage on GSLB
controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162
Configuration example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164
Guidelines and recommendations for using this feature . . . .165