Setting Up a Layer 3 Segment

The following workflow describes the steps for configuring overlay segments for the existing overlay fabrics in Aruba Central.

  1. Step 1: Configure the Overlay Segment
  2. Step 2: Assign Roles
  3. Step 3: Select Edge and Stub Devices for the Overlay Segments
  4. Step 4: View the Overlay Segment Summary

Step 1: Configure the Overlay Segment

To configure an overlay segment for the AOS-CX Switch, complete the following steps:

  1. In the Aruba Central app, complete the following steps:
    • To select a group in the filter:
      1. Set the filter to a group.

        The dashboard context for the group is displayed.

      2. Under Manage, click Devices > Switches.
      3. To view the AOS-CX Switch configuration dashboard, click the AOS-CX or Config icon.
  2. Click Routing > Fabrics.
  3. In the Fabrics table, to select the row for the fabric, click the icon.

    The Overlay Network & VLAN Virtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN. section is displayed.

    Figure 1  Overlay Network & VLAN Page

    The following table describes the columns in the Devices table.

    Table 1: Overlay Network & VLAN Table Parameters



    Layer 2 Segment

    The toggle is enabled when configuring Layer 2 segment only.

    Overlay Network

    List of overlay networks. You can select the overlay network that you want to create the service segment for, from the list.

    VLAN Name

    Option to provide the VLAN name.


    The VLAN ID number.

    IP Version

    Option to select the IP version.

    • IPv4

    • IPv6

    • Dual Stack

    Default Gateway IP

    Option to define the default Gateway IP for the overlay network.

    Subnet Mask

    Option to provide the subnet Subnet is the logical division of an IP network. mask for the IP address.

    DHCP Server VRF

    The default DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  server VRF Virtual Routing and Forwarding. VRF is a technology that allows multiple instances of a routing table to co-exist within the same router. value or you can add manually.

    Note: You can manually add multiple DHCP server relays.

    DHCP Server

    The IP address of the DHCP relay server.

  4. In the Overlay Network & VLAN table, provide all the details.

  5. Click Next. The Roles section is displayed with a list of all the global roles defined on the Client Roles page.

Step 2: Assign Roles

This section indicates the roles that can be assigned to endpoints or users that are part of this segment.

To assign roles that you want to allow to participate in the overlay network segment, complete the following steps:

Figure 2  Roles Page

  1. Select the roles to participate in the overlay network segment.

  2. Click Next. The Devices section is displayed.

Step 3: Select Edge and Stub Devices for the Overlay Segments

In the Devices section, select the devices which you want to apply on the segment. You can either select individual devices or select all the devices and attach to the overlay fabric.

Figure 3  Devices Page

Step 4: View the Overlay Segment Summary

To view the overlay segment summary, complete the following steps:

In the Devices section, click Next. The Summary section is displayed where you can view the summary of your configuration.

Figure 4  Summary Page