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D-Link Unified Access System User Manual
In general, only clients that transmit and receive time-sensitive data while roaming need to
take advantage of this feature. Figure 43 shows a network with two APs that are controlled by
a D-Link Unified Switch. The APs and switch are all on different subnets.
Figure 43. L3 Roaming Example
Both of the APs in Figure 43 use the same default profile. The default profile has three virtual
access points (VAPs) enabled, and each VAP uses a different network (SSID). When users
search for available wireless networks, all three SSIDs appear in the list of networks. The
laptop clients connect to the Company WLAN or Guest Network, and the VoIP phones
connect to the VoIP Network.
The L3 Tunnel feature is enabled on the VoIP network, but it is disabled on the Guest and
Company WLAN networks since those networks are primarily for data traffic. The VoIP
network is for voice traffic. L3 Roaming uses IP tunneling so clients appear to be on the same
subnet even though the APs are on different subnets.
In the sample network that Figure 43 shows, the laptop users are connected to different WLAN
networks on two different APs. The Internet phone users are connected to the same WLAN
network on two different APs. On the VoIP Network, the phone users can seemlessly roam
between AP1 and AP2 without service interruption or the need to re-authenticate or change
networks.
The Unified Switch uses a VLAN routing interface as a separate logical network configured
for the L3 tunnel network. This network is the L3 tunneling subnet and has a network address
of 192.168.100.0.
Tunneling is not expected to work with port-based routing interfaces. All tunneled routing
interfaces must be VLAN routing interfaces. APs should not be attached via port-based
routing interfaces as well.
AP1
Associated With:
3 VAPs
SSID - Guest Network
SSID - Company WLAN
AP2
3 VAPs:
SSID - Guest Network
SSID - Company WLAN
SSID - VoIP Network
AP1
SSID: Company WLAN
Associated With:
AP2
SSID: Guest Network
Associated With:
AP2
SSID: VoIP Network
Associated With:
AP1
SSID: VoIP Network
IP: 192.168.20.20
IP: 192.168.30.11
IP: 192.168.100.52
IP: 192.168.100.51
SSID - VoIP Network
Unified Switch
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