DWS-3160 Series Gigabit Ethernet Unified Switch Hardware Installation Guide
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Figure 5-3 Unified Access System Deployment with 3 Unified Switches
Peer Unified Switches share information about APs and allow Layer 3 roaming among them. To support this, peer
Unified Switches establish IPv4 tunnels so that the wireless client keeps the same IP address even when the client
associates with an access point in a different subnet. The Layer 3 roaming service allows wireless phone users to
roam between access points connected to different subnets without dropping calls.