2. Once wireless connectivity is confirmed, you can check which AP your laptop
connects to [ WLAN/ Monitoring/ Client/ Associated Clients ].
3. Start to Ping one of the LAN interfaces (172.17.5.253 or .254) or its loopback
interface ( 192.168.10.254 ).
4. Disconnect the AP which your laptop is associated with and see how soon you can
roam to the other AP. Normally 1 ping loss is observed when roaming. (
Note:
Please
see section 3.6.1 below for an alternative mechanism for simulating a roam)
5. You can repeat step 2-4 and observe your laptop roam from AP to AP without
changing IP, and with limited packet loss.
Note:
You will not be able to seamlessly roam between AP1 and AP2 using the other
SSIDs since these are not configured for L3 Tunneling and these APs are on different IP
subnets which will require the client to obtain a new IP address on a non tunneled SSID.
3.6.2 Simulated Roam via Disabling Radios
The following procedure shows how to simulate a roam by disabling the radio the client
is currently associated with. By using this method, the link between the AP and the
Wireless switch will not go down and therefore the local route will not be removed and
the above mentioned routing loop issue will not happen.
1. Use your laptop to test wireless connection by associating to the “L3-Tunnel” SSID
Network, and check if you’re getting the IP address correctly from the Wireless
switch’s DHCP server on the Tunnel subnet.
2. Once wireless connectivity is confirmed, you can check which AP your laptop
connects to [ WLAN/ Monitoring/ Client/ Associated Clients ].
3. Start to Ping one of the LAN interfaces (172.17.5.253 or .254) or its loopback
interface ( 192.168.10.254 ).
4. Enable AP “debug” mode to allow direct Telnet access to the APs CLI
[ WLAN/Administration/AP Management/Advanced ].
5. Open a Telnet session to the IP address of the AP which your client has associated
with and login.
6. Disable the radios with this command: “set radio all status down”. You will observe
the client roam to the other AP with minimal ping loss.
3.6.3 Real Roam
A real-world roam involves physically moving from near one AP to the other such that
your client will automatically associate with the closer AP of stronger signal strength.
This is best shown when the APs are adequately separated to allow signal strength
decrease as you move away one AP and signal strength increase from the other AP as you
move nearer. Wireless VoIP phones are the best clients to use since they are tuned to
roam if a stronger signal is detected from another nearby AP. PC clients are not tuned for
these rapid roams and therefore will often allow the signal strength to decrease
significantly before selecting a stronger signal AP to associate with – this can cause
traffic loss simply associated with a weak signal. To facilitate the client’s decision to
