public TransitGatewayConfiguration withRoutableCIDRSpace(String routableCIDRSpace) {
        setRoutableCIDRSpace(routableCIDRSpace);
        return this;
    }
<p>
The routing CIDR on behalf of kdb environment. It could be any "/26 range in the 100.64.0.0 CIDR space. After
providing, it will be added to the customer's transit gateway routing table so that the traffics could be routed
to kdb network.
</p>

@param routableCIDRSpace
       The routing CIDR on behalf of kdb environment. It could be any "/26 range in the 100.64.0.0 CIDR space.
       After providing, it will be added to the customer's transit gateway routing table so that the traffics
       could be routed to kdb network.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-finspace/src/main/java/com/amazonaws/services/finspace/model/TransitGatewayConfiguration.java