Bridging Segments
Bridging 220T Hubs
A bridge allows two segments to communicate with each other. Typically, a bridge connects segments operating at different speeds, but it can also connect segments operating at the same speed. By default, the Express 220T’s internal bridge is active so 10Mbps and 100Mbps segments are automatically bridged.
The 220T’s Enable/Disable bridging button allows the hub’s internal bridge to be turned off. Disabling the internal bridge prevents a loopback error if the 10Mbps and 100Mbps segments are bridged externally (through a switch for example). Another reason to disable the bridge is to keep traffic isolated on each segment.
Guidelines for bridging a stack of 220T hubs
•Only one bridge is active at a time. If that hub fails or is removed, the next 220T automatically provides bridging for the stack.
•When active, the Bridged LED is illuminated on all hubs in the stack.
•Pressing the Enable/Disable Bridging button on any hub turns bridging on or off for the entire stack.
•Disable the internal bridge if you are bridging segments externally (through a switch) to prevent a loopback condition.
Example 1: 220T hubs stacked with 210T hubs
A quick way to bridge 210Ts or Express 10/100 hubs is to add a 220T to the stack. The ports at 100Mbps on the 220T hubs will be in the same segment as the 210T hub operating at 100Mbps; just as the ports at 10Mbps on the 220T hubs will be in the same segment as the 210T hub at 10Mbps.
|
|
| Bridge |
| 220T (Hub 1) | 10Mbps | 100Mpbs |
|
|
| |
All ports at 10Mbps |
|
| 100Mbps |
share the same | 210T (Hub 2) |
| |
|
| ||
segment |
|
|
|
|
|
|
|
|
|
220T (Hub 3) |
| 10Mbps |
| 100Mpbs |
|
|
|
|
|
|
|
This 220T provides bridging for all hubs in the stack.
All ports at 100Mbps share the same segment
210T (Hub 4)
10Mbps
10
