Brocade Communications Systems 12.4.00 manual Site persistence in Gslb using hashing

1 Site persistence in GSLB using hashing

Deleting sticky GSLB session for a specific client

To delete Sticky GSLB sessions for a specific client, enter a command such as the following:

ServerIronADX#clear gslb sticky-session client-ip 100.1.1.101

Syntax: clear gslb sticky-session client-ip <client-ip>

The <client-ip>is the IP address or prefix of the client for which sticky session will be deleted.

Deleting all sticky GSLB sessions

To delete all the Sticky GSLB sessions globally, enter a command such as the following:

ServerIronADX# clear gslb sticky-session all

Syntax: clear gslb sticky-session all

For a GSLB sticky session to be synced, you must configure symmetric-port with port and VLAN information on both the master and backup ServerIron ADX switches as shown in the following:

ServerIronADX(config)# server symmetric-port ethernet 7 vlan-id 7

Site persistence in GSLB using hashing

Hash-based GSLB persistence provides GSLB controller persistence in a multiple GSLB controller environment for the same domain. When users query for a host name, regardless of which GSLB controller is contacted, the users will get the same answer.

Sticky GSLB alone is sufficient for single-box and HA (hot standby, symmetric, sym-active) topologies. However, if there are two GSLB controllers across a network providing GSLB for the same domain but are not in an HA configuration, and if persistence is desired when the same client is directed to either of these two GSLB controllers, then hash-based GSLB persistence should be used.

Enabling hash-based GSLB persistence

Hash-based GSLB persistence can be enabled for all domains or only for specific domains. This feature cannot be enabled concurrently with Sticky GSLB in the same policy. Although, you can enable Sticky GSLB for one policy and hash-based GSLB persistence for another policy.

To enable hash-based GSLB persistence globally, enter commands on the GSLB controller, such as the following:

SLB-ServerIronADX(config)# gslb policy

SLB-ServerIronADX(config-gslb-policy)# hash-persist

Syntax: hash-persist

Displaying the hash table

A hash table is maintained for a domain for which hash-based GSLB persistence is enabled in the associated policy. There are 256 entries in the hash table, and there is a domain IP address associated with each of these entries.

70	ServerIron ADX Global Server Load Balancing Guide
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