Mobility and Client Management
This section provides the following information on Layer-3 Mobility for Instant AP clients:
Layer-3 Mobility
Instant APs form a single Aruba Central network when they are in the same Layer-2 (L2) domain. As the number of clients increase, multiple subnetsSubnet is the logical division of an IP network. are required to avoid broadcast overhead. In such a scenario, a client must be allowed to roam away from the Aruba Central network to which it first connected (home network) to another network supporting the same WLANWireless Local Area Network. WLAN is a 802.11 standards-based LAN that the users access through a wireless connection. access parameters (foreign network) and continue its existing sessions.
Layer-3 (L3) mobility allows a client to roam without losing its IP address and sessions. If WLAN access parameters are the same across these networks, clients connected to Instant APs in a given Aruba Central network can roam to Instant APs in a foreign Aruba Central network and continue their existing sessions using their IP addresses. You can configure a list of Virtual Controller IP addresses across which L3 mobility is supported.
Home Agent Load Balancing
Home Agent Load Balancing is required in large networks where multiple tunnels might terminate on a single border or lobby AP and overload it. When load balancing is enabled, the VC assigns the home AP for roamed clients by using a round robin policy. With this policy, the load for the APs acting as Home Agents for roamed clients is uniformly distributed across the Instant AP cluster.
Configuring L3 Mobility Domain
To configure a mobility domain, you have to specify the list of all Aruba Central networks that form the mobility domain. To allow clients to roam seamlessly among all the APs, specify the VC IP for each foreign subnet. You may include the local Aruba Central or VC IP address, so that the same configuration can be used across all Aruba Central networks in the mobility domain.
Aruba recommends that you configure all client subnets in the mobility domain. When client subnets are configured:
If a client is from a local subnet, it is identified as a local client. When a local client starts using the IP address, the L3 roaming is terminated.
If the client is from a foreign subnet, it is identified as a foreign client. When a foreign client starts using the IP address, the L3 roaming is set up.
To configure a Layer-3 Mobility domain, complete the following steps:
1. In the app, set the filter to a group that contains at least one AP.
The dashboard context for the group is displayed.
2. Under , click > .
A list of access points is displayed in the view.
3. Click the icon.
The tabs to configure the access points are displayed.
4. Click , and click the tab.
The System details page is displayed.
5. Click the accordion.
6. Turn on the toggle switch. By default, home agent load balancing is disabled.
7. Under , click , and enter an IP address name in the window, and then click .
Repeat Step 7 to add the IP addresses of all VCs that form the L3 mobility domain.
8. Under , click , and specify the following:
a. Enter the client subnet in the box.
b. Enter the mask in the box.
c. Enter the VLANVirtual 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. ID in the home network in the box.
d. Enter the home VC IP address for this subnet in the box.
e. Click .
