DHCP Server Redundancy using Cisco Routers!!!
In order to build resiliency in your network you absolutely have to have redundant DHCP LAN servers. You can use your Cisco routers or switches as DHCP servers to provide this capability. Here is a simple topology:
(Click on the Picture Below to Enlarge)
In the above diagram we have two core (CORE_1 and CORE_2) routers acting as a single gateway via HSRP. We have our DHCP ranges defined as follows… CORE_1 is serving IPs in the following range --> 172.16.0.11 through 172.16.0.127 and CORE_2 is serving IPs in the following range --> 172.16.0.129 through 172.16.0.254. Remember we can’t use 172.16.0.0 (Network Address) and 172.16.0.255 (Broadcast Address).