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Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
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Rev Version 2.19
Figure 55 Site B WDS Configuration 2
Example 3: Adding Redundancy
In the example below, 4 x access points (A, B, C, and D) form a mesh network using only WDS bridge interfaces.
Each of the access points may also have its own associated clients. Each access point is configured with a
different SSID, which means that the clients associated with each access point are fixed.
Figure 56 WDS Redundancy
Sites A, B, C, and D can all exchange data with each other (as can all of their stations) as if they were all on the
same wired segment. Notice that there are redundant paths, and therefore the possibility for loops to occur. The
bridge Spanning Tree Protocol should therefore be enabled, and depending on the size of the mesh, a bridge
priority should possibly be configured.
Bridge priority is used to determine the connection priority when selecting an interface to put into the forwarding
state. You can assign higher priority values to interfaces that you want spanning tree to select first, and lower
priority values to interfaces that you want spanning tree to select last. If all interfaces have the same priority value,
the MAC address is used to work out the priority.
To illustrate the redundancy, consider that if Site A needs to send data to Site D it has redundant paths through
both B and C. However, due to the spanning tree protocol only one of B or C will relay the data, with the other
taking over in the event of a failure.
In this example, Site B uses its primary access point to act as an access point for virtual stations on Site A and
D, and uses a virtual station to act as a client to Site C. Sites A and D use two virtual stations to act as clients to
Site B and to Site C. The configuration for Site B and A and D are shown below.
