How to Configure the DHCP Option60 Mode for Huawei OLT

This topic is applicable to the scenario for specifying the corresponding DHCP servers for different option60 domain users. This configuration also works for Huawei MA5680T, Huawei MA5606T, Huawei MA5608T.

Prerequisites

A VLAN must be created.

Before the configuration, determine the option60 domain name of the user terminal.

Background Information

When multiple services are provisioned on the MA5600, such as video multicast and IP telephone services, the services are provided by different service providers. The service providers may use different relay IP addresses of the same DHCP server or different DHCP servers to allocate IP addresses to users. Therefore, configure the users to apply for IP addresses from the DHCP server in the DHCP option60 mode.

In the DHCP option60 mode, the DHCP server group is selected according to the character string (namely, domain name) in the option60 of DHCP packets. Here, the option60 domain name and the DHCP server group to which the domain name is bound need to be configured beforehand. In this mode, users are differentiated according to the domain information in the packet, and different service types in the same VLAN can also be differentiated.

Procedure

1.           Configure the DHCP forwarding mode.

In the global config mode, run the dhcp mode layer-3 option60 command to configure the DHCP relay mode to L3 option60 mode (layer-3, option60). If keyword VLAN is selected and VLANID is entered, this configuration takes effect only for this VLAN.

2.           Configure the DHCP server group.

a.                In the global config mode, run the dhcp-server command to create a DHCP server group.

·                           igroup-number: Indicates the number of the DHCP server group. It identifies a server group. You can run the display dhcp-server all-group command to query the DHCP server groups that are already configured and select a DHCP server group number that is not used by the system.

·                           ip-addr: Indicates the IP address of the DHCP server in the DHCP server group. Up to four IP addresses can be entered.

 NOTICE:

The IP address of the DHCP server configured here must be the same as the IP address of the DHCP server on the network side.

b.                (Optional) Run the dhcp server mode command to configure the working mode of the DHCP server.

The DHCP servers in the DHCP server group can work in the load balancing mode or active/standby mode. By default, they work in the load balancing mode.

3.           Create a DHCP option60 domain.

In the global config mode, run the dhcp domain command to create a DHCP domain, and then enter the DHCP domain mode. The option60 domain name needs to be configured according to the type of the terminal connected to the device. For the DHCP client installed with the Windows 98/2000/XP/NT series of OSs, the domain name must be msft.

4.           Bind the DHCP option60 domain to the DHCP server group.

In the option60 domain mode, run the dhcp-server command to bind the DHCP domain to the DHCP server group. After the configuration is completed, the DHCP clients belonging to the DHCP correspond to the DHCP server group.

5.           Configure the IP address of the gateway corresponding to the DHCP domain.

a.                In the global config mode, run the interface vlanif command to create a VLAN L3 interface.

The VLAN ID must be the same as the ID of the VLAN described in the prerequisite.

b.                In the VLANIF mode, run the ip address command to configure the IP address of the VLAN L3 interface.

After the configuration is completed, this IP address is used as the source IP address for forwarding the IP packets in the VLAN at L3.

 NOTICE:

·                           If only an L2 device exists between the MA5600 and the DHCP server, the IP address of the VLAN L3 interface needs to be in the same subnet as the IP address of the DHCP server.

·                           If the upper-layer device of the MA5600 is an L3 device, the IP address of the VLAN L3 interface and the IP address of the DHCP server can be in different subnets; however, a route must exist between the VLAN L3 interface and the DHCP server. For details, see Configuring the Route.

c.                In the VLANIF mode, run the dhcp domain gateway command to configure the IP address of the gateway corresponding to the DHCP domain.

The IP address of the gateway must be a configured IP address of the VLAN interface. Under the same VLAN interface, different option60 domains can be configured with different gateways. Therefore, different DHCP servers can be selected according to the domain information in the packet.

Example

Assume that server group 2 contains two DHCP servers working the load balancing mode, with the IP address of the primary server 10.10.10.10 and the IP address of the secondary server 10.10.10.11. To bind server group 2 to users whose option60 domain name is msft in VLAN 2 (with the IP address of the L3 interface 10.1.2.1/24), do as follows:

huawei(config)#dhcp mode layer-3 Option60

huawei(config)#dhcp-server 2 ip 10.10.10.10 10.10.10.11

huawei(config)#dhcp domain msft

huawei(config-dhcp-domain-msft)#dhcp-server 2

huawei(config-dhcp-domain-msft)#quit

huawei(config)#interface vlanif 2

huawei(config-if-vlanif2)#ip address 10.1.2.1 24

huawei(config-if-vlanif2)#dhcp domain msft gateway 10.1.2.1