Hi Sun:
     It seems similar, but  there is a tiny difference but worth a shot following your suggestion.
     As we can see from /var/log/daemon.log,the compute node assigned an IP not belong to the mgmt subnet, while your second node got  an right ip.
2019-07-31T16:12:47.000 controller-0 dnsmasq-dhcp[3416]: info DHCPDISCOVER(eno3) 6c:92:bf:2a:43:1e
2019-07-31T16:12:47.000 controller-0 dnsmasq-dhcp[3416]: info DHCPOFFER(eno3) 169.254.202.216 6c:92:bf:2a:43:1e
2019-07-31T16:12:48.000 controller-0 dnsmasq-dhcp[3416]: info DHCPREQUEST(eno3) 169.254.202.216 6c:92:bf:2a:43:1e
2019-07-31T16:12:48.000 controller-0 dnsmasq-dhcp[3416]: info DHCPACK(eno3) 169.254.202.216 6c:92:bf:2a:43:1e
2019-07-31T16:12:48.000 controller-0 dnsmasq-tftp[3416]: err error 0 TFTP Aborted received from 169.254.202.216
2019-07-31T16:12:48.000 controller-0 dnsmasq-tftp[3416]: info failed sending /pxeboot/pxelinux.0 to 169.254.202.216

Thanks!
At 2019-08-03 09:59:29£¬"Sun, Austin" <austin.sun@intel.com>  Wrote£º
>Hi Gao Song:
>¡¡Your issue might be same as we met before [1].  We just change mgmt. subnet to 192.178.xx.xx to solve this issue. could you try this?
>
>[1] http://lists.starlingx.io/pipermail/starlingx-discuss/2019-May/004485.html
>
>Thanks.
>BR
>Austin Sun. 
>
>From: gao.song [mailto:gaosong_1250@163.com] 
>Sent: Friday, August 2, 2019 11:53 PM
>To: starlingx-discuss@lists.starlingx.io
>Subject: [Starlingx-discuss] [STX 1.0] Seek for alternative way to install compute node
>
>Hi community:
>     Since we encounter some difficult problems using PXE to boot a compute node,it just get a pxeboot subnet ip(169.254.202.xxx) instead of a management subnet£¨192.168.xx.xx£©. 
>     As a result installation procedure will hold after load initrd file.
>     So we wonder if there  is another way to install a compute node with a standard mode controller, like install the compute using ISO manually and then issue  configure commands  to just enable compute sub-function.
>     Any help will be appreciated!
>
>
> 
>_______________________________________________
>Starlingx-discuss mailing list
>Starlingx-discuss@lists.starlingx.io
>http://lists.starlingx.io/cgi-bin/mailman/listinfo/starlingx-discuss