Chapter 29
| DHCP Commands
DHCP Relay Option 82
– 845 –
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A DHCP relay server has been set on the switch, when the switch receives a
DHCP request packet with a non-zero relay agent address field (that is not
the address of this switch).
■
A DHCP relay server has been set on the switch, when the switch receives a
DHCP reply packet without option 82 information from the management
VLAN.
■
The reply packet contains a valid relay agent address field (that is not the
address of this switch), or receives a reply packet with a zero relay agent
address through the management VLAN.
■
A DHCP relay server has been set on the switch, and the switch receives a
reply packet on a non-management VLAN.
◆ Use the ip dhcp relay information policy command to specify how to handle
DHCP client request packets which already contain Option 82 information.
◆ DHCP Snooping Information Option 82 (see page 307) and DHCP Relay
Information Option 82 cannot both be enabled at the same time.
Example
This example enables Option 82.
Console(config)#ip dhcp relay information option
Console(config)#
Related Commands
ip dhcp relay information policy (846)
ip dhcp relay server (842)
ip dhcp snooping (305)
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