Hi Team,
we are trying to deploy the triple0 Stein release on Centos 7. Undercloud is getting deployed successfully but the introspection of the overcloud node is getting failed with the reason as below:

on the DNS podman logs:
()[root@undercloud dhcp-hostsdir]# tail -f /var/log/ironic-inspector/dnsmasq.log
Dec  7 11:21:08 dnsmasq-dhcp[8]: DHCPDISCOVER(br-ctlplane) f8:f2:1e:9e:82:51 ignored
Dec  7 11:21:08 dnsmasq-dhcp[8]: DHCPDISCOVER(br-ctlplane) f8:f2:1e:9e:82:50 ignored
Dec  7 11:21:12 dnsmasq-dhcp[8]: DHCPDISCOVER(br-ctlplane) f8:f2:1e:9e:82:51 ignored

Checking the TCPDUMP at the same time gives:
11:38:38.308660 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from f8:f2:1e:9e:82:51 (oui Unknown), length 300
11:38:38.435173 IP6 fe80::f53a:6448:4a29:e051 > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28
11:38:38.435184 IP6 fe80::f53a:6448:4a29:e051 > ff02::16: HBH ICMP6, multicast listener report v2, 1 group record(s), length 28
11:38:41.155784 IP6 fe80::322d:3253:e3b2:316e > ff02::2: ICMP6, router solicitation, length 8
11:38:41.394304 IP6 fe80::f53a:6448:4a29:e051 > ff02::2: ICMP6, router solicitation, length 8
11:38:42.563182 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from f8:f2:1e:9e:82:50 (oui Unknown), length 300
11:38:42.611973 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from f8:f2:1e:9e:82:51 (oui Unknown), length 300

We observed that DHCP Server is not offering the IP to the baremetal. 
DHCP discovery comes at br-ctlplane but no ip is offered.

Any input would be really helpful.

Best Regards,
Lokendra