Configuring The Dhcp Relay Agent; Specifying The Packet Forwarding Address - Cisco IE-4000 Software Configuration Manual

Configuring DHCP
How to Configure DHCP

Only one IP address can be assigned per port.

Reserved addresses (preassigned) cannot be cleared by using the clear ip dhcp binding global configuration
command.

Preassigned addresses are automatically excluded from normal dynamic IP address assignment. Preassigned
addresses cannot be used in host pools, but there can be multiple preassigned addresses per DHCP address pool.

To restrict assignments from the DHCP pool to preconfigured reservations (unreserved addresses are not offered to
the client and other clients are not served by the pool), you can enter the reserved-only DHCP pool configuration
command.
How to Configure DHCP

Configuring the DHCP Relay Agent

Command
1. configure terminal
2. service dhcp
3. end

Specifying the Packet Forwarding Address

Command
1. configure terminal
2. interface vlan vlan-id
3. ip address ip-address subnet-mask
4. ip helper-address address
5. exit
Purpose
Enters global configuration mode.
Enables the DHCP server and relay agent on your switch. By default, this
feature is enabled.
Returns to privileged EXEC mode.
Purpose
Enters global configuration mode.
Creates a switch virtual interface by entering a VLAN
ID, and enters interface configuration mode.
Configures the interface with an IP address and an IP
subnet.
Specifies the DHCP packet forwarding address.
The helper address can be a specific DHCP server
address, or it can be the network address if other
DHCP servers are on the destination network
segment. Using the network address enables other
servers to respond to DHCP requests.
If you have multiple servers, you can configure one
helper address for each server.
Returns to global configuration mode.
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