I understand you have deployed an Azure Redhat Openshift Cluster but see that the Pod CIDR is 10.100.0.0/14 instead of the expected 10.128.0.0/14.
The Pod CIDR and Service CIDR can both be modified during the deployment if using the ARM template. See here for an example template which has these parameters.
Modifying these CIDRs for the SDN should be possible. The cluster administrators can control pod network settings on master hosts by modifying parameters in the
networkConfig section of the master configuration file (located at /etc/origin/master/master-config.yaml by default). The OpenShift documentation goes over this configuration in detail.
Hope this helps! Let me know if you still have questions and I will be happy to assist.
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@Ajith Anilkumar Did you still have questions? Let me know if I can help further.