Brocade Communications Systems ServerIron ADX 12.4.00 Manual Manual page 4

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Site persistence in GSLB using stickiness. . . . . . . . . . . . . . . . . . . . .64
Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Enabling sticky GSLB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Allowing sticky sessions for a specific prefix length . . . . . . . . . 67
Configuring the sticky GSLB session life time . . . . . . . . . . . . . . 67
Displaying current sticky GSLB sessions . . . . . . . . . . . . . . . . . . 68
Sticky GSLB counters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Deleting sticky GSLB session for a specific client . . . . . . . . . . . 70
Deleting all sticky GSLB sessions . . . . . . . . . . . . . . . . . . . . . . . . 70
Site persistence in GSLB using hashing . . . . . . . . . . . . . . . . . . . . . . 70
Enabling hash-based GSLB persistence . . . . . . . . . . . . . . . . . . 70
Displaying the hash table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Hashing scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
IP address allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
IP address failure or removal from domain . . . . . . . . . . . . . . . . 72
Rehash: new IP address for a domain or change of state . . . . 72
Disabling rehash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Hash-persist hold-down: boot up considerations if rehash disabled
74
Manually forcing rehash for a domain . . . . . . . . . . . . . . . . . . . . 74
Show commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Weighted distribution of sites with hash-based persistence . . . . . . 76
Overview of distribution of sites with hash-based persistence. 76
Configuring distribution of sites with hash-based persistence. 79
Configuring weights for domain IP addresses . . . . . . . . . . . . . . 81
Disabling rehash on introduction of new IP addresses or state
change from down to healthy . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Disable rehash when weight for an IP is changed. . . . . . . . . . . 81
Displaying the contents of active RTT cache entries . . . . . . . . . . . . 84
Affinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Defining the affinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Displaying RTT prefix cache entries . . . . . . . . . . . . . . . . . . . . . . 87
Displaying affinity selection counters. . . . . . . . . . . . . . . . . . . . . 88
GSLB domain-level affinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Overview of GSLB domain-level affinity . . . . . . . . . . . . . . . . . . . 88
Command line interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
DNS cache proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Enabling DNS cache proxy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Displaying DNS cache proxy state . . . . . . . . . . . . . . . . . . . . . . . 92
Displaying DNS cache proxy statistics . . . . . . . . . . . . . . . . . . . . 93
Combining the DNS cache proxy and DNS override features . . 94
GSLB DNS type any query . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Transparent DNS query intercept. . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Redirecting queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Redirecting queries and perform GSLB . . . . . . . . . . . . . . . . . . . 99
Responding to queries directly . . . . . . . . . . . . . . . . . . . . . . . . .100
Displaying transparent DNS query intercept statistics . . . . . .101
Enabling DNS request logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Distributed health checks for GSLB . . . . . . . . . . . . . . . . . . . . .104
ServerIron ADX Global Server Load Balancing Guide
53-1002437-01