User's Manual

CHAPTER 7
REPEATING FEATURES
Revised: 23 Jan 08 7-3 EST P/N AA107G
The following sections describe the process of the STP in the ESTeem Model 195Eg as how it would happen in the above example.
Learning Phase - Once properly configured, each Model 195Eg will begin to search out the other Model 195Eg units in radio range
that are programmed in the AP Repeater Peer table. All Model 195Eg’s will calculate their routes to every Model 195Eg in the
network based upon the lowest “path cost” to the Root Bridge. Path cost is the total cost of transmitting a packet through the
wireless network to the Root Bridge. Note: The Root Bridge in a network should be the Model 195Eg where the majority of the
data flow is processed. In every wireless network of two or more radios, the Root Bridge should be user defined. If not defined, the
ESTeem 195Eg with the lowest MAC address will be designated as the Root Bridge.
In Figure 4, the Plant network (Example 1) is the most logical location for the Root Bridge based upon the amount of data flow.
Setting this site as the root bridge is discussed below in Root Bridge.
Blocking and Forwarding Phase – To ensure you do not have a network loop situation due to redundant paths in your wireless
network, the Model 195Eg will recognize and disable (block) one or more redundant links and provide back up links should the
primary link fail. This establishes a wireless mesh network with a series of forwarding links, based upon the shortest path cost to the
Root Bridge.
For example, looking at Figure 4, the Remote Building has two routes to the Root Bridge (Plant Network – Example #1); directly to
the site and through the repeater. The direct link between the two sites is the shortest route (lowest Path Cost) and will be selected
as the primary route unless overridden by manually changing the Path Cost in the configuration.
Access Point Router
with Repeater
Feature Enabled
10/100BaseT
HUB or Switch
Mobile
PLC
EtherStation
Mode
10/100BaseT
Access Point Bridge
with Repeater
Feature Enabled
P
r
i
m
a
r
y
R
e
p
e
a
t
e
r
P
a
t
h
B
a
c
k
u
p
R
e
p
e
a
t
e
r
P
a
t
h
Access Point Bridge
with Repeater
Feature Enabled
Mobile Vehicle
Single Ethernet Device
Example #4
S/N: 14004
P
r
i
m
a
r
y
R
e
p
e
a
t
e
r
P
a
t
h
Plant Network
Large Wired LAN
Example #1
S/N: E-14001
WLAN MAC=00:04:3F:00:09:01
Remote Building
Small Ethernet Wired LAN
Example #3
S/N: E-14003
WLAN MAC=00:04:3F:00:09:10
Stand-Alone Repeater Site
Example #2
S/N: E-14002
WLAN MAC= 00:04:3F:00:09:05
Network
Router
(Required)
Figure 4: Programming Example #1 Diagram