OpenStack baremetal introspection bulk start fails - Red hat Openstack Director

I am trying to install director and overcloud.
Followed steps from : https://keithtenzer.com/2015/10/14/howto-openstack-deployment-using-tripleo-and-the-red-hat-openstack-director/comment-page-1/#comment-1335
In this environment we have used KVM hypervisor host , the undercloud (single VM) and overcloud (1 compute VM , 1 controller VM). . The KVM hypervisor host is on the 192.168.122.0/24 network and has IP of 192.168.122.136. The undercloud runs on a single VM on the 192.168.122.0/24 management network and 192.168.126.0/24 (provisioning) netowrk. The undercloud has an IP address of 192.168.122.90 (eth0). The overcloud is on the 192.168.126.0/24 (provisioning) and 192.168.125.0/24 (external) network.

I have facing issue while introspection (command: openstack baremetal introspection bulk start). The overcloud VMs are getting started but unable to configure network interface. Eventually introspection fails. Can anyone tell me what might have gone wrong?