Brocade Communications Systems 12.4.00 manual ServerIron ADX Global Server Load Balancing Guide

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-persisthold-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

iv	ServerIron ADX Global Server Load Balancing Guide
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