Hi @myquestforLearning ,
Thanks for posting in Q&A platform.
This is Sunny from windows network team. I discussed with our SCCM OSD engineer and found that in theory you could use Cisco router as DHCP for SCCM OSD and the prerequisite is ensuring that client, DHCP server and PXE-enabled DP are in the same subnet in OSD. If they are in different subnet, then IP helper will be needed. As long as the client can obtain available IP address from DHCP, the SCCM OSD will work normally.
I also found a video regarding of Cisco DHCP setting for SCCM OSD and an article regarding of troubleshooting PXE boot issues in Configuration Manager for your reference. Please kindly check if they are helpful.
Troubleshooting PXE boot issues in Configuration Manager
Cisco DHCP setting for SCCM OSD
Please Note: Since the websites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.
Best Regards,
Sunny
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