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Configuring DHCP Service DHCP Relay Configuration
User Guide 569
Switch(config)#service dhcp relay
Switch(config)#show ip dhcp relay
Switch(config)#ip dhcp relay hops 5
Switch(config)#ip dhcp relay time 10
DHCP relay state: enabled
DHCP relay hops: 5
DHCP relay Time Threshold: 10 seconds
...
Switch(config)#end
Switch#copy running-config startup-config
3.2.2 (Optional) Configuring Option 82
Follow these steps to configure Option 82:
Step 1 configure
Enter Global Configuration Mode.
Step 2 interface {
fastEthernet
port
| range fastEthernet
port-list
| gigabitEthernet
port
| range
gigabitEthernet
port-list
| ten-gigabitEthernet
port
| range ten-gigabitEthernet
port-list
}
Enter Interface Configuration Mode.
Step 3 ip dhcp relay information option
Enable the Option 82 feature on the port.
Step 4 ip dhcp relay information strategy { keep | replace | drop }
Specify the operation for the switch to take when receiving DHCP packets that include the
Option 82 field.
keep: The switch keeps the Option 82 field of the packets.
replace: The switch replaces the Option 82 field of the packets with a new one. The switch
presets a default circuit ID and remote ID in TLV (Type, Length, and Value) format. You can
also configure the format to include Value only and customize the Value.
drop: The switch discards the packets that include the Option 82 field.
Step 5 ip dhcp relay information format { normal | private }
Specify the packet format for the sub-option fields of Option 82.
normal: Indicates the fields consist of three parts: Type, Length, and Value (TLV).
private: Indicates the fields consist of the value only.
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