dhcp policy-vlan mac-address

Function

The dhcp policy-vlan mac-address command configures the MAC address-based DHCP policy VLAN.

The undo dhcp policy-vlan mac-address command deletes the MAC address-based DHCP policy VLAN.

By default, the function of DHCP policy VLAN based on MAC addresses is disabled on the device.

Format

dhcp policy-vlan mac-address mac-address1 [ to mac-address2 ] [ priority priority ]

undo dhcp policy-vlan mac-address mac-address1 [ to mac-address2 ]

Parameters

Parameter	Description	Value
mac-address1 [ to mac-address2 ]	Specifies the MAC addresses of user hosts that access the network for the first time. mac-address1 specifies the start MAC address. to mac-address2 specifies the end MAC address. mac-address2 must be greater than mac-address1. mac-address2 and mac-address1 specify the MAC address range. If to mac-address2 is not specified, DHCP policy VLAN based on only the MAC address specified by mac-address1 is configured.	mac-address1 and mac-address2 are in the format of H-H-H. An H contains one to four hexadecimal numbers. NOTE: The range specified by mac-address1 and mac-address2 cannot contain multicast MAC addresses, broadcast MAC addresses, and all 0 address. The number of MAC addresses cannot exceed 512.
priority priority	Specifies the 802.1p priority of DHCP messages.	The value is an integer that ranges from 0 to 7. The default value is 0.

Views

VLAN view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

You can configure three types of DHCP policy VLAN on the device at the same time. They are listed in descending order based on priorities as follows:

DHCP policy VLAN based on MAC addresses
DHCP policy VLAN based on interfaces
Generic DHCP policy VLAN

On a network supporting VLAN assignment based on IP subnets, upon receiving an untagged packet from a host, a switch adds a VLAN ID to the packet based on the source IP address of the packet. A host that accesses the network for the first time does not have a valid IP address. Therefore, the switch cannot add the host to the VLAN and the host cannot obtain a valid IP address or network settings. To make the host obtain a valid IP address from the DHCP server, run the dhcp policy-vlan mac-address command to configure the MAC address-based DHCP policy VLAN.

Prerequisites

DHCP has been enabled globally using the dhcp enable command in the system view.

Precautions

If you run this command based on the same MAC address in multiple VLAN views, only the latest configuration takes effect.

Example

# Configure the MAC address-based DHCP policy VLAN, associate DHCP packets from the host with the MAC address 0001-0001-0001 to VLAN 100, and set the 802.1p priority of the packets to 5.

<HUAWEI> system-view
[HUAWEI] dhcp enable
[HUAWEI] vlan 100
[HUAWEI-vlan100] dhcp policy-vlan mac-address 1-1-1 priority 5