User's Manual

Configuration Parameters 15
Roaming Between Access Points
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 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. Refer to the Harmony Access Point
Controller User's Guide for more information.
Roaming Guidelines
• An 802.11a CardBus Card can only roam between 802.11a Access Points.
• All Harmony 802.11a Access Points must have the same SSID.
• All workstations with Harmony 802.11a client adapters must have the same SSID
as the Access Points that they will roam between.
• If WEP encryption is enabled, then all 802.11a Access Points and client adapters
must use the same encryption level and WEP Key(s) 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.
AP.book Page 15 Wednesday, October 3, 2001 4:12 PM