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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
Specifying the Packet Forwarding Address
Command Purpose
1. configure terminal Enters global configuration mode.
2. service dhcp Enables the DHCP server and relay agent on your switch. By default, this
feature is enabled.
3. end Returns to privileged EXEC mode.
Command Purpose
1. configure terminal Enters global configuration mode.
2. interface vlan vlan-id Creates a switch virtual interface by entering a VLAN
ID, and enters interface configuration mode.
3. ip address ip-address subnet-mask Configures the interface with an IP address and an IP
subnet.
4. ip helper-address address 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.
5. exit Returns to global configuration mode.
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