WESM zl Management and Configuration Guide WT.01.28 and greater

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Wireless Network Management
Network Self Healing
Neighbor Recovery
When enabled on the Wireless Edge Services zl Module, neighbor recovery can
automatically configure radios to change their settings to compensate for another
radio’s failure.
Both the Wireless Edge Services zl Module and RP radios monitor for failed radios.
The RPs monitor neighbors by listening for beacons from RPs that they have learned
that they can hear on their channel.
Note Both single-channel detectors and dedicated detectors can monitor neighbors. How-
ever, dedicated detectors monitor all channels instead of just one. For this reason, it
can be a good idea to configure one RP in a self-healing network as a dedicated
detector (depending, of course, on the total number of RPs).
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.
■ Neighbors no longer receive beacons from the radio.
An RP checks the beacons that it has received every 30 seconds. If the RP has
not received beacons from a neighbor in the last two seconds, it reports that
neighbor as down. In other words, an RP considers a neighbor failed when it
loses contact with that neighbor for more than two seconds; however, the RP
only checks whether it has lost contact with a neighbor every 30 seconds.
■ Neighbors fail to detect Wireless Internet Service Provider (WISP) heartbeats
from the radio.
Enabling Neighbor Recovery
To enable neighbor recovery, complete these steps:
1. Select Special Features > Self Healing > Configuration.