multiple bootprelay servers

[bw447]

We are working on building a more resilient network. One key part is DHCP. Our server team is working on setting up our servers (Windows 2012 R2) to be able to handle the requests. I just need to have our routers be able to forward the request to the proper DHCP server. Currently our routers (x460 EXOS 15.5.2.9) only forwards requests to our one DHCP server (per building) and it works great. If that server goes down or offline for any reason we want users to still be able to obtain an IP address. How do we add a second server to the router. Do we just add a second IP to the bootprelay part of the config configure bootprelay add vr VR-Default configure bootprelay add vr VR-Default If that's the case how does the system keep track of which server it's passing to? Thanks in advance!

[Bruce_Garlock]

Hello, we just configured Win2k12R2 with redundant DHCP, with the secondary acting as a passive (hot standby) role. On our x-460's which currently have a setting pointing to the primary server, it sounds like we just need to add another line and point it to the IP of the standby server?

[john16]

You should be able to just add another address. At least that is the way it works on the S-series. The system will relay the DHCP packet to both servers. It lets the DHCP protocol work it out. Basically the first DHCP packet to make it back to the client wins. Typically what you do is split the scope 80\20 across the two servers and you tell your secondary server to delay its response by 5 seconds or so. Check this out.