Users Guide

Dell PowerConnect W-AirWave 7.4 | Configuration Guide Configuration Reference | 97
Link Threshold
(1-255)
12 Use this setting to optimize operation of the link metric algorithm.
Indicates the minimal RSSI value. If the RSSI value is below this threshold, the link
may be considered a subthreshold link. A sub-threshold link is one whose average
RSSI value falls below the configured link threshold.
If this occurs, the mesh node may try to find a better link on the same channel and
cluster (only neighbors on the same channel are considered).
The supported threshold is hardware dependent, with a practical range of 1 to 255.
Reselection Mode startup-
subthreshold
Use this setting to optimize operation of the link metric algorithm.
Specify the method a mesh node uses to find a better uplink to create a path to the
mesh portal. Only neighbors
on the same channel in the same mesh cluster are considered.
Available options are:
 reselect-anytime—Connected mesh nodes evaluate mesh links every 30
seconds. If a mesh node finds a better uplink, the mesh node connects to the
new parent to create an improved path to the mesh portal.
 reselect-never—Connected mesh nodes do not evaluate other mesh links to
create an improved path to the mesh portal.
 startup-subthreshold—When bringing up the mesh network, mesh nodes have 3
minutes to find a better uplink. After that time, each mesh node evaluates
alternative links only if the existing uplink falls below the configured threshold
level (the link becomes a sub-threshold link). The reselection process is
cancelled if the average RSSI on the existing uplink rises above the configured
link-threshold.
 subthreshold-only—Connected mesh nodes evaluate alternative links only if the
existing uplink becomes a sub-threshold link.
NOTE: The default value is recommended.
Metric Algorithm distributed-
tree-rssi
Use this setting to optimize operation of the link metric algorithm.
Specify the algorithm used by a mesh node to select its parent.
Available options are:
 best-link-rssi—Selects the parent with the strongest RSSI, regardless of the
number of children a potential parent has.
 distributed-tree-rssi—Selects the parent based on link-RSSI and node cost
based on the number of children. This option evenly distributes the mesh points
over high quality uplinks. Low quality uplinks are selected as a last resort.
NOTE: The default value is recommended.
802.11g Portal Channel
(1-14)
Blank Each 802.11a and 802.11g radio profile references an Adaptive Radio Management
(ARM) profile. When you assign an active ARM profile to a mesh radio, ARM's
automatic power-assignment and channel-assignment features automatically
select the radio channel with the least amount of interference for each mesh portal,
maximizing end user performance. In earlier versions of this software, an AP with a
mesh radio received its beacon period, transmission power and 11a/11g portal
channel settings from its mesh radio profile. Mesh-access AP portals now inherit
these radio settings from their dot11a or dot11g radio profiles.
NOTE: Do not delete or modify mesh cluster profiles once you use them to provision
mesh nodes. You can recover the mesh point if the original cluster profile is still
available. Creating a new mesh cluster profile is recommended, if needed.
802.11a Portal Channel
(34-165)
Blank
Beacon Period
(60-999999 msec)
100 Define the beacon period supporting mesh profiles, as described for the fields
immediately above.
Transmit Power
(0-30 dBm)
30 Define the transmission power supporting mesh profiles, as described for the portal
channel settings immediately above. This setting supports a range from 0 to 30 dBm.
Retry Limit (0-15) 4 Indicate the number of times a mesh node can re-send a packet. This setting
supports a range from 0 to 15.
Table 42 Profiles > Mesh > Radio Profile Settings (Continued)
Field Default Description