Configuring Dhcp Address Allocation Using Option 82 - Cisco Catalyst 4500 Series Software Configuration Manual
Cisco ios xe release 3.9.xe and cisco ios release 15.2(5)ex
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Also See for Catalyst 4500 Series:
- Administration manual (1814 pages) ,
- Configuration manual (1610 pages) ,
- Command reference manual (1230 pages)
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Chapter 59
Configuring the Cisco IOS DHCP Server
Command or Action
Switch(config-if)# end
Step 9
Switch# show ip dhcp import
Step 10
Configuring DHCP Address Allocation Using Option 82
•
•
Enabling Option 82 for DHCP Address Allocation
By default, the Cisco DHCP server uses information provided by option 82 to allocate IP addresses. If
the DHCP address allocation is disabled, perform the task described in this section to reenable this
capability.
Command or Action
Step 1
Switch> enable
Step 2
Switch# configure terminal
Step 3
Switch(config)# ip dhcp use class
Switch(config)# end
Step 4
Troubleshooting Tips
If DHCP classes are configured in the pool, but the DHCP server does not use the classes, verify if the
no ip dhcp use class command was configured.
Defining the DHCP Class and Relay Agent Information Patterns
Before You Begin
You must know the hexadecimal value of each byte location in option 82 to configure the
relay-information hex command. The option 82 format may vary from product to product. Contact the
relay agent vendor for this information.
Perform this task to define the DHCP class and relay agent information patterns.
Enabling Option 82 for DHCP Address Allocation, page 59-21
Defining the DHCP Class and Relay Agent Information Patterns, page 59-21
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Purpose
Exits interface configuration mode and returns to privileged
EXEC mode.
Displays the options that are imported from the central DHCP
server.
Purpose
Enables privileged EXEC mode.
Enter your password if prompted.
•
Enters global configuration mode.
Controls DHCP classes that are used for address allocation.
•
This functionality is enabled by default.
Use the no form of this command to disable this functionality
•
without deleting the DHCP class configuration.
Exits global configuration mode and returns to privileged EXEC
mode.
Configuring DHCP Address Pools
59-21
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