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95| Network Configuration Parameters Dell Networking W-Series ArubaOS 6.5.x| User Guide
Configuring a VLAN to Receive a Dynamic Address
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, you can connect the controller to a DSL or cable modem, or a
broadband remote access server (BRAS). The following figure 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 from the uplink device.
Figure 12 IP Address Assignment to VLAN via DHCP or PPPoE
Configuring Multiple Wired Uplink Interfaces (Active-Standby)
You can assign up to four VLAN interfaces to operate in active-standby topology. An active-standby topology
provides redundancy so that when an active interface fails, the user traffic can failover to the standby
interface.
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:
l You can enable the DHCP/PPPoE client multiple uplink VLAN interfaces (up to four) on the controller; these
VLANs cannot be VLAN 1.
l Only one port in the VLAN can be connected to the modem or uplink switch.
l 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.
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.
In 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. Enter a priority value for the VLAN ID in the Uplink Priority field. All wired uplink interfaces have the same
priority by default. If you want to use an active-standby topology, then prioritize each uplink interfaces by
entering a different priority value (1– 4) for each uplink interface.