Chapter 25
| DHCP Commands
DHCP Relay Option 82
– 643 –
Example
This example enables Option 82, and sets the frame format of the remote ID for the
option to use the MAC address of the switch’s CPU.
Console(config)#ip dhcp relay information option remote-id mac-address
Console(config)#
Related Commands
ip dhcp relay information policy (643)
ip dhcp relay server (639)
ip dhcp snooping (270)
ip dhcp relay
information policy
This command specifies how to handle client requests which already contain DHCP
Option 82 information.
Syntax
ip dhcp relay information policy {drop | keep | replace}
drop - Floods the original request packet onto the VLAN that received it
instead of relaying it.
keep - Retains the Option 82 information in the client request, inserts the
relay agent’s address, and unicasts the packet to the DHCP server.
replace - Replaces the Option 82 information circuit-id and remote-id fields
in the client’s request packet with information provided by the relay agent
itself, inserts the relay agent’s address, and unicasts the packet to the DHCP
server.
Default Setting
drop
Command Mode
Global Configuration
Usage Guidelines
◆ Refer to the Usage Guidelines under the ip dhcp relay information option
command for information on when Option 82 information is processed by the
switch.
◆ When the Option 82 policy is set to “keep” the original information in the
request packet, the frame type specified by the ip dhcp relay information
option command is ignored.
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