Route to servers that are in maintenance mode
We can build complex rule conditions from subexpressions to modify routing policy Session Initiation Protocol(SIP) rules, and route certain messages to servers that are in maintenance mode while routing other traffic to servers that are not in maintenance mode from within the same dynamic cluster.
To modify rules through the rule builder, you must have administrator privileges.
(zos) Restriction: Intelligent Management does not support SIP features on the z/OS operating system.
Typically, only servers that are not in maintenance mode receive and service application requests. We can also route to servers that are in maintenance mode, so we can route to a subset of servers to verify configuration changes or troubleshoot issues without interfering with availability. We can direct SIP traffic to specific clusters with routing rules. The expressions for SIP routing rules are enhanced to support an expression that provides more functionality and flexibility in defining the target cluster. For example, the expression cluster='TestCell/TestClusterA' and serverMaintanceMode='affinity' direct the on demand router (ODR) to route calls to members of TestClusterA that are in maintenance mode. We can also use this function in conjunction with the prioritized routing rules.
- From the administrative console, click Servers > Server types > On demand routers > odr_name > SIP on demand router settings > Routing policy SIP rules > Specify by > Expression > Subexpression builder.
- Select and as the logical operator.
- Select Server maintenance mode as the operand.
- Select Equals (=) as the operator.
- Select Affinity as the value. Click Generate subexpression.
- Click Append to add the subexpression to the rule.
Related concepts
Rule-based request classification
Related tasks
Set maintenance mode
Intelligent Management: routing and service policies
Related information:
Intelligent Management: rules for ODR routing policy administrative tasks Intelligent Management: rules for ODR service policy administrative tasks