Figure 4 -4 Three Separate Collision Domains
When a hub is segmented from the rest of the stack, the Segmented indicator
on the front panel display will light. For information about segmenting hubs
using the console interface, see Chapter 6 in this User's Guide.
information about segmenting hubs using the network management module
for the hub, see the management module's User's Guide.
Building Hub Stacks
Hub segmentation is controlled by the master
hub. While the hub is performing its Power-On
Self-Test (POST), all hubs in the stack will be
connected together in a single segment. When
the master hub completes its initialization, it will
restore any segmentation of the hubs.
Therefore, if you are using a switch or bridge to
join different segments, be sure to enable the
IEEE 803.1d Spanning Tree Protocol to
prevent temporary network loops.
10BASE-T Stackable Hubs