Configure DHCP Server and Relay Settings

About this task

For small networks that do not already have a DHCP server, you can configure and enable a DHCP server on an Extreme Networks device to provide network settings dynamically to clients. After you configure one hive member as a DHCP server, the other hive members forward the DHCPDISCOVERY and DHCPREQUEST messages to their neighbors. The device you use as the DHCP server must be a portal. When all hive members are in the same subnet and all devices in that subnet are on a single VLAN, you only need to configure the DHCP server device with a pool of IP addresses it can draw from when responding to DHCP client requests. When some hive members are in a different subnet from the DHCP server, you must also configure those devices to forward DHCP traffic to the IP address of the DHCP server. In this case, the other devices act as DHCP relay agents. You can configure both DHCP servers and relay agents here.

Procedure

  1. Select the add icon.
  2. Enter a name.
  3. Enter an optional description.
  4. Select the name of the DHCP server or relay agent interface from the drop-down list.
  5. Select DHCP server or DHCP relay agent.
    The DHCP relay enhancement supports deployments when a centralized DHCP server (for example, at corporate headquarters) is used. When you enable DHCP Relay, the DHCP server feature on devices is disabled so that routers redirect DHCP service requests to the centralized DHCP server.
  6. Enable or disable Set the DHCP server as authoritative.
    If this DHCP server is the only one on your network, it knows what the valid IP numbers on the network are. If a client tries to register with an invalid IP address (for example, if a client device still has an active lease with another network), an authoritative DHCP server denies access to that client.
  7. Enable Use ARP to check for IP address conflicts when this DHCP server uses ARP to check for IP address conflicts on the network before assigning an IP address to a DHCP client.
  8. Select Enable NAT Support if this DHCP server uses NAT.
  9. For IP Pool, define the IP address pool from which the DHCP server draws IP addresses when making assignments.
    1. Select the add icon to add a new IP pool.
    2. Enter the start and end IP addresses.
    3. Select Add.
  10. To configure each of the required parameters that the DHCP server will return to clients along with an IP address, see Configure DHCP Server Options.
  11. To define custom DHCP options to provide additional network settings to connected clients, see Configure Custom DHCP Options.
  12. Select Save.