Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 69)

Brocade Virtual ADX Global Server Load Balancing Guide 59
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Site persistence in GSLB using stickiness
1
The random option configures the controller to regenerate session keys for the peer site ADX device
at a bounded random frequency.
When used with random, the duration parameter specifies the bound on the random key
regeneration duration in minutes. The key will be randomly regenerated between 1 minute and the
upper bound specified by the duration parameter.
Minimum GSLB configuration
Following is a sample minimum GSLB controller configuration for Secure GSLB. Note the si
secure-communication command.
Site persistence in GSLB using stickiness
Sticky GSLB enables the GSLB controller to return the same IP address if a client sends multiple
DNS requests within a configurable period of time. This feature ensures the client is directed to the
site that was previously visited. For example, a business case for Sticky GSLB includes when
user-specific content is stored at one site, such as a shopping cart. Being redirected to a site that
no longer stores the content would result in a lost session.
To return the same IP address for a client that has sent requests previously, the GSLB controller
must save the following information:
• Client IP address/prefix
• Domain name the client requested
• Selected IP address for the request
This information is saved in a session table when the Sticky GSLB feature is enabled, and the GSLB
controller creates a sticky session for each client within the session table. Each session has a
special user type and source port or destination port number to distinguish from other sessions.
When a new request enters the system, the GSLB controller searches for the client IP and domain
name pair. If a match is found, the previously selected IP address will be returned.
server real dns-rs 10.20.20.105
port dns
port dns one "brocade.com"
port dns proxy
port http
port http url "HEAD /"
!
!
server virtual dns-vs 10.8.8.200
port dns
port http
bind dns dns-rs dns
bind http dns-rs http
!
gslb protocol
gslb sit brocade
si si-1 10.2.2.1
si si-2 10.2.2.3 secure-communication
gslb dns zone brocade.com
host-info www http