Users Guide

Table Of Contents
Dell PowerConnect ArubaOS 5.0 | User Guide Network Parameters | 61
z Dynamically assigned from a Dynamic Host Configuration Protocol (DHCP) or Point-to-Point Protocol over
Ethernet (PPPoE) server. These methods are described in the following section.
In a branch office, you can connect a controller to an uplink switch or server that dynamically assigns IP addresses
to connected devices. For example, the controller can be connected to a DSL or cable modem, or a broadband
remote access server (BRAS). Figure 2 shows a branch office where a controller connects to a cable modem.
VLAN 1 has a static IP address, while VLAN 2 has a dynamic IP address assigned via DHCP or PPPoE on the
uplink device. The DHCP server on the controller assigns IP addresses to users on the local network from a
configured pool of IP addresses.
Figure 2 IP Address Assignment to VLAN via DHCP or PPPoE
To allow the controller to obtain a dynamic IP address for a VLAN, enable the DHCP or PPPoE client on the
controller for the VLAN.
The following restrictions apply when enabling the DHCP or PPPoE client on the controller:
z You can enable the DHCP/PPPoE client on only one VLAN on the controller; this VLAN cannot be VLAN 1.
z Only one port in the VLAN can be connected to the modem or uplink switch.
z At least one interface in the VLAN must be in the up state before the DHCP/PPPoE client requests an IP
address from the server.
z Only one VLAN on the controller can obtain its IP address through DHCP or PPPoE. You cannot enable both
the DHCP and PPPoE client on the controller at the same time.
Enabling the DHCP Client
The DHCP server assigns an IP address for a specified amount of time called a lease. The controller automatically
renews the lease before it expires. When you shut down the VLAN, the DHCP lease is released.
Using the WebUI
1. Navigate to the Configuration > Network > IP > IP Interfaces page.
2. Click Edit for a previously-created VLAN.
3. Select Obtain an IP address from DHCP.
4. Click Apply.
Using the CLI
vlan <id>
interface vlan <id>
ip address dhcp-client
Enabling the PPPoE Client
To authenticate to the BRAS and request a dynamic IP address, the controller must have the following
configured:
z PPPoE user name and password to connect to the DSL network
z PPPoE service name — either an ISP name or a class of service configured on the PPPoE server
When you shut down the VLAN, the PPPoE session terminates.
VLAN 1
VLAN 2
To Internet
To Local
Network
Cable Modem or
BRAS
Controller