User manual

WI-MOD-9-E Wireless Ethernet User Manual
WI-MOD-9-E Manual V1.9 Page 36
Fallback Probation Counter must be met also.
Drop Link On Retry
Threshold
When enabled, the module will drop radio link if all retries for
sending a packet fails. When disabled, the module will only drop
link on failure of regular link check transmissions, sent regularly on
inactivity of 6 times the beacon interval. Disabling this item can
improve usability of poor radio paths.
Coexist Mode When enabled, the module will holdoff retries longer to avoid
interfering with module outside radio range. When disabled on an
AP, the AP will shuffle retries with packets destined for other
modules. When disabled on a Client, the module will reduce delay
between retries.
Apply Changes Update settings.
Apply Changes and Save Update settings and save to non-volatile memory.
3.10 Spanning Tree Algorithm / Redundancy
The “Spanning Tree Algorithm” function was introduced to handle network loops and provide
redundant paths in networks. The Spanning Tree Algorithm can be configured, however the
factory default setting is “disabled”.
For example, consider this network with a redundant wireless link. If the Spanning Tree
Algorithm function is enabled, one of the two wireless links will be disabled - that is, all wireless
data will be transferred by one link only. If the active link fails, the other link will automatically
start transferring the wireless data.
The Spanning Tree Algorithm implemented is IEEE 802.1d compatible. The algorithm forms a
loop-free network by blocking traffic between redundant links in the network. These blocked
links are placed in a standby condition, and may be automatically enabled to repair the network if
another link is lost. The Spanning Tree Algorithm maintains a single path between all nodes in a
network, by forming a tree-like structure. The Bridge Priority determines where the node sits in
the tree. A Bridge with the lowest priority configured (0) will become the root node in the
network, and will direct traffic between each of its branches. The root node is typically the unit
that handles the majority of traffic in the network. As a low bandwidth radio device, the WI-
MOD-9-E is configured with a Bridge Priority of (255) by default. The intention is reduce traffic