Configuring The Dhcp Relay Agent; Enabling Dhcp Snooping And Option 82 - Cisco 3020 - Catalyst Blade Switch Configuration Manual
Cisco catalyst blade switch 3020 for hp software configuration guide, rel. 12.2(25)sef1
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Also See for 3020 - Cisco Catalyst Blade Switch:
- Command reference manual (744 pages) ,
- Release note (54 pages) ,
- Getting started manual (37 pages)
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Configuring DHCP Features
•
•
Configuring the DHCP Relay Agent
Beginning in privileged EXEC mode, follow these steps to enable the DHCP relay agent on the switch:
Command
Step 1
configure terminal
Step 2
service dhcp
Step 3
end
Step 4
show running-config
Step 5
copy running-config startup-config
To disable the DHCP server and relay agent, use the no service dhcp global configuration command.
See the "Configuring DHCP" section of the "IP Addressing and Services" section of the Cisco IOS IP
Configuration Guide, Release 12.2 for these procedures:
•
•
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
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
17-8
If a switch port is connected to a DHCP client, configure a port as untrusted by entering the no ip
dhcp snooping trust interface configuration command.
Do not enter the ip dhcp snooping information option allow-untrusted command on an
aggregation switch to which an untrusted device is connected. If you enter this command, an
untrusted device might spoof the option-82 information.
Purpose
Enter global configuration mode.
Enable the DHCP server and relay agent on your switch. By default, this
feature is enabled.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Checking (validating) the relay agent information
Configuring the relay agent forwarding policy
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.
Chapter 17
Configuring DHCP Features
OL-8915-01
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Troubleshooting
