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Configuration
Roaming Between Access Points
If there are multiple Harmony 802.11a Access Points on the network, then a mobile
client may seamlessly roam from one Access Point to another.
Each Access Point creates its own wireless cell or coverage area. This is also known as
a Basic Service Set (BSS). A mobile device can communicate with a particular Access
Point if it is within the Access Point's coverage area.
If the cells of multiple Access Points overlap, then the mobile client may switch from
one Access Point to another as it travels throughout the facility. During the hand-off
from one Access Point to another, the mobile client maintains an uninterrupted
connection to the network. This is known as "roaming."
In addition, a mobile client can roam between Access Points located on different IP
networks as long as the Access Points on the remote networks are partnered to an AP
Controller on the local network. The client maintains an uninterrupted connection to
the network and retains its assigned IP address that is valid on the AP Controller's
local subnet.
This feature requires that the network administrator configure the AP Controller with a
list of subnets used in the facility so the AP Controller and Access Points can
communicate with each other across the router. In addition, each Harmony 802.11a
Access Point that is installed on a remote subnet must be in Tunneled mode. Refer to
the Harmony Access Point Controller User's Guide for more information.
Roaming Guidelines
•
A Harmony 802.11a client can only roam between Harmony 802.11a Access
Points. An 802.11a client cannot communicate with Harmony 802.11b or OpenAir
Access Points.
•
All Harmony 802.11a Access Points must have the same SSID.
•
All workstations with Harmony 802.11a client adapters installed must use either
an SSID of "any" or the same SSID as the Access Points that they will roam
between.
•
All 802.11a Access Points and clients must have the same security settings to
communicate.
•
The Access Points' cells must overlap to ensure that there are no gaps in coverage
and to ensure that the roaming client will always have a connection available.
•
All Access Points in the same vicinity should use a unique, independent Channel.
•
Access Points that use the same Channel should be installed as far away from
each other as possible to reduce potential interference.
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