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DELL N3000 User Manual

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Configuring DHCP Server and Relay Settings
The administrator is using a Microsoft DHCP server. Microsoft DHCP servers 
do not have native support for DHCP Option 82, but it can be added using 
the DhcpServerCalloutEntry API to retrieve the information via the 
DhcpHandleOptionsHook configured on the switches. Adding Option 82 
support enables choosing whether or not a particular DHCP server should 
respond to the DHCP request, and whether it should only respond to requests 
from a particular switch (as identified by the remote-id) and port (as 
identified by the circuit-id). For further information and an example, follow 
this web link:
For Linux-based systems, which natively support option 82, a configuration to 
serve two private pools (Pool1 and Pool2) and one public pool of DHCP 
addresses based upon the remote-id and circuit-id might look like the 
following:
dhcpd.conf file:
class "Pool1" {
  match option agent.remote-id;
  match option agent.circuit-id;
}
subclass "Pool1" "Switch A" "Gi1/0/1";
subclass "Pool1" "Switch A" "Gi1/0/2";
subclass "Pool1" "Switch A" "Gi1/0/3";
class "Pool2" {
  match option agent.remote-id;
  match option agent.circuit-id;
}
subclass "Pool2" "Switch B" "Gi1/0/1";
subclass "Pool2" "Switch B" "Gi1/0/2";
subclass "Pool2" "Switch B" "Gi1/0/3";
shared-network Public {
  subnet 10.1.222.0 netmask 255.255.254.0 {
   pool {
    deny members of "Pool1";
    deny members of "Pool2";
    option routers 10.1.222.1;