Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 170)

160 Brocade Virtual ADX Global Server Load Balancing Guide
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Advanced GSLB configuration for IPv6
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To specify the prefix length, enter commands such as the following:
SLB-Ctrl-Virtual ADX(config)#gslb policy
SLB-Ctrl-Virtual ADX(config-gslb-policy)#sticky ipv6-prefix-length 64
Syntax: [no] sticky ipv6-prefix-length decimal
The decimal parameter specifies the prefix length of IPv6 DNS clients. The parameter enables you
to aggregate DNS clients into one sticky session. The default prefix length is 128 bits.
NOTE
Brocade Virtual ADX does not support the synchronization of sticky sessions across BPs. With sticky
ipv6-prefix-length configured, DNS requests from clients on the same subnet go to different BPs and
different sticky sessions will be created on different BPs. However, each individual client will receive
the same specific domain IP that it received in its previous DNS request.
Specifying sticky session life times
Sometimes clients do not accept DNS servers, thus creating stale sessions. The sticky GSLB
session life time (age) prevents sessions from hanging for extended periods of time.
By default, the life time (age) of sticky sessions is set at five minutes. Use the sticky age command
to specify the time (in minutes) that must past before an idle session “times out” and session
resources are made available to other clients.
To configure the Sticky GSLB session life time (age), enter commands such as the following:
SLB-Ctrl-Virtual ADX(config)#gslb-host-policy test
SLB-Ctrl-Virtual ADX(config-gslb-host-policy-test)#stick age 5
Syntax: [no] sticky age value
The value is the number of minutes before sticky session is cleared.
Deleting sticky sessions
The clear gslb ipv6 sticky-session command enables you to clear all sticky sessions or sticky
sessions for a specific client.
Syntax: clear gslb ipv6 sticky-session (all | client-ip )
The client-ip is the IP address or prefix of the client for which sticky session will be deleted. If the all
option is used, the sticky sessions for all clients are cleared.
High availability considerations for IPv6 sticky persistence
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.
Controllers, when configured in HA scenarios, will need to sync their sticky sessions in order to
maintain persistence across the controllers. This is similar to the IPV4 sticky persistence behavior.