Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.01.03 or greater

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Wireless Network Management
Network Self Healing
Network Self Healing
Self healing keeps your wireless network functioning optimally in response
to changing conditions. A radio in a self-healing network can automatically
change the properties of its radio frequency (RF) network, which include:
■ channel
■ transmit power
■ supported rates
By managing this ability, the Wireless Edge Services xl Module provides two
basic services:
■ Neighbor Recovery—When radios detect that a neighbor has failed, they
automatically adjust settings so they can support as many of the stations
associated with the failed radio as possible.
■ Interference Avoidance—Radios adjust their channel setting to avoid
interfering with neighboring radios.
Neighbor Recovery
When you implement this capability on the Wireless Edge Services xl Module,
it can automatically configure radios to change their settings to compensate
for another radio’s failure.
Both the Wireless Edge Services xl Module and RP radios monitor for failed
radios. The RPs monitor neighbors by listening for beacons from RPs that they
have learned they can hear on their channel.
Note Both normal RPs and dedicated detectors can monitor neighbors. However,
detectors monitor all channels instead of just one. For this reason, it can be a
good idea to dedicate one RP in a self-healing network as a detector (depend-
ing, of course, on the total number of RPs).
Note also that you do not have to activate AP detection in order for normal
RPs to monitor neighbors on their channel.
A radio “fails” in any of these circumstances:
■ The module no longer recognizes the RP as adopted.
In other words, the module and the RP cannot communicate, whether due
to a physical or a logical problem.