You can configure your network to contain multiple tiers
of on demand routers (ODRs). In multi-tiered environments, configure
the ODRs to have unique ODRSESSIONIDs for the different tiers.
Before you begin
You must enable cell affinity and configure the ODRs. For
details, read about creating and configuring ODRs and enabling cell
affinity.
About this task
An example environment for configuring cell affinity might
include a cluster of ODRs that distribute load to multiple IBM® Portal application servers at
the front end of the network, while at the back end there are clusters
of ODRs that distribute load to multiple Web content managers.
There
are three important configuration requirements for this task:
- Within a tier, any generic server cluster configurations you create
for cell affinity must refer only to ODRs within that tier.
- Within a tier, the ODR session identifier cookie name, which is
named ODRSESSIONID by default, must be unique for all the other tiers.
You must configure this cookie name as a custom property on each ODR
within that tier, as described in the procedure in this topic.
- If you are using the highly available (HA) plugin configuration
generator, each plugin-cfg.xml configuration must define the ODR session
identifier cookie name to use the IBM HTTP
Server to configure ODR affinity. To define the ODR session identifier
cookie name, define an additional cell-wide custom property associated
with the plugin-cfg.xml generation configuration: ODCPluginCfgOdrSessionIdCookie_<configname>=CookieName>.
For more information about configuring the HA plug-in configuration
generator, read about configuring an ODR to dynamically update the
web server plug-in configuration.
Procedure
- From the administrative console, select .
- Expand On demand router properties.
- Click .
- Type odrSessionIdCookieName for
the name value.
- Type the new cookie name. For example, ODRSID_TIER1.
- Repeat steps 3 through 5 for every ODR within the tier.