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Chapter 20
Configuring DHCP Features and IP Source Guard
Command
Step 4
ip helper-address address
Step 5
exit
Step 6
interface range port-range
or
interface interface-id
Step 7
switchport mode access
Step 8
switchport access vlan vlan-id
Step 9
end
Step 10
show running-config
Step 11
copy running-config startup-config
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:
Command
Step 1
configure terminal
Step 2
ip dhcp snooping
Step 3
ip dhcp snooping vlan vlan-range
Step 4
ip dhcp snooping information option
OL-8915-03
Purpose
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.
Return to global configuration mode.
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.
Define the VLAN membership mode for the port.
Assign the ports to the same VLAN as configured in
Step 2.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enable DHCP snooping globally.
Enable DHCP snooping on a VLAN or range of VLANs. The range is 1
to 4094.
You can enter a single VLAN ID identified by VLAN ID number, a series
of VLAN IDs separated by commas, a range of VLAN IDs separated by
hyphens, or a range of VLAN IDs separated by entering the starting and
ending VLAN IDs separated by a space.
Enable the switch to insert and remove DHCP relay information
(option-82 field) in forwarded DHCP request messages to the DHCP
server. This is the default setting.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring DHCP Features
20-11
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Troubleshooting
