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AOS-W Instant 6.3.1.1-4.0 | User Guide Mobility and Client Management | 200

Chapter 16

Mobility and Client Management

This chapter provides the following information:

l Layer-3 Mobility Overview on page 200

l Configuring L3-Mobility on page 201

Layer-3 Mobility Overview

OAW-IAPs form a single AOS-W Instant network when they are in the same Layer-2 (L2) domain. As the number of

clients increase, multiple subnets are required to avoid broadcast overhead. In such a scenario, a client must be

allowed to roam away from the AOS-W Instant network to which it first connected (home network) to another

network supporting the same WLAN 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 same across these networks, clients connected to OAW-IAPs in a given AOS-W Instant network can roam to

APs in a foreign AOS-W Instant network and continue their existing sessions. Clients roaming across these

networks are able to continue using their IP addresses after roaming. You can configure a list of Virtual Controller IP

addresses across which L3 mobility is supported.

AOS-W Instant Layer-3 mobility solution defines a Mobility Domain as a set of Instant networks, with same WLAN

access parameters, across which client roaming is supported. The AOS-W Instant network to which the client first

connects is called its home network. When the client roams to a foreign network, an AP in the home network (home

AP) anchors all traffic to or from this client. The AP to which the client is connected in the foreign network (foreign

AP) tunnels all client traffic to or from the home AP through a GRE tunnel.

Figure 65 Routing of traffic when the client is away from its home network

When a client first connects to an AOS-W Instant network, a message is sent to all configured Virtual Controller IP

addresses to see if this is an L3 roamed client. On receiving an acknowledgement from any of the configured Virtual

Controller IP addresses, the client is identified as an L3 roamed client. If the AP has no GRE tunnel to this home

network, a new tunnel is formed to an AP (home AP) from the client's home network.

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