19-11
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 19 Configuring DHCP Features and IP Source Guard
Configuring DHCP Features
To remove the DHCP packet forwarding address, use the no ip helper-address address interface
configuration command.
Enabling DHCP Snooping and Option 82
Beginning in privileged EXEC mode, follow these steps to enable DHCP snooping on the switch:
Step 4
ip helper-address address Specify 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.
Step 5
exit Return to global configuration mode.
Step 6
interface range port-range
or
interface interface-id
Configure multiple physical ports that are connected
to the DHCP clients, and enter interface range
configuration mode.
or
Configure a single physical port that is connected to
the DHCP client, and enter interface configuration
mode.
Step 7
no shutdown Enable the interface(s), if necessary. By default, user
network interfaces (UNIs) and enhanced network
interfaces (ENIs) are disabled and network node
interfaces (NNIs) are enabled.
Step 8
switchport mode access Define the VLAN membership mode for the port.
Step 9
switchport access vlan vlan-id Assign the ports to the same VLAN as configured in
Step 2.
Step 10
end Return to privileged EXEC mode.
Step 11
show running-config Verify your entries.
Step 12
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip dhcp snooping Enable DHCP snooping globally.
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