Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 60)

48 ServerIron ADX Global Server Load Balancing Guide
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Configuring GSLB protocol parameters
1
GSLB active bindings enhancements
The following features have been added to GSLB active bindings:
• Weighed active bindings
• Minimum active bindings
• Tracking an application port for active bindings
Configuring weighted active bindings
Weighted Active Bindings allows you to configure the GSLB ServerIron ADX to direct requests to
domain VIPs in proportion to their active bindings. For example, if VIP-1 has 2 active bindings and
VIP-2 has 1 active binding, you can configure the GSLB ServerIron ADX to direct two-thirds of the
client requests to VIP-1 and one-third of the client requests to VIP-2.
To enable weighted active bindings for the global GSLB policy, first enable the active bindings using
the existing active-bindings CLI command, then configure the following additional command.
ServerIronADX# configure terminal

ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# weighted-selection

ServerIronADX(config-gslb-policy)# end

ServerIronADX#
To enable weighted active bindings for the host level policy, first enable the active bindings using
the existing active-bindings CLI command, then configure the following additional command.
ServerIronADX# configure terminal

ServerIronADX(config)# gslb-host-policy abc

ServerIronADX(config-gslb-host-policy-abc)# weighted-selection

ServerIronADX(config-gslb-host-policy-abc)# end

ServerIronADX#
Using minimum active bindings
You can configure the GSLB ServerIron ADX to use the minimum active bindings among all
application ports if multiple application ports are associated with a domain. For example, if
application ports http and ftp are configured for www.companynet.com, you may need the active
bindings count for the VIPs to be based on the minimum of the active bindings for these two
application ports. You can configure the GSLB ServerIron ADX to use minimum bindings as follows.
ServerIronADX# configure terminal

ServerIronADX(config)# gslb dns zone companynet.com

ServerIronADX(config-gslb-dns-companynet.com)# host-info www http

ServerIronADX(config-gslb-dns-companynet.com)# host-info www ssl

ServerIronADX(config-gslb-dns-companynet.com)# host-info www min-bindings

ServerIronADX(config-gslb-dns-companynet.com)# end
Tracking an application port for active bindings
You can configure the GSLB ServerIron ADX to track a particular application port for active bindings
if multiple application ports are associated with a domain. For example, if application ports HTTP
and SSL are configured for www.companynet.com, you may need the active bindings count for the
VIPs to be based only on the active bindings for the HTTP port but not the SSL port. You can
configure the GSLB ServerIron ADX to track active bindings for the http port only as follows.