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Segmentation divides networks into segments, or smaller networks, of fewer
users. These segments maintain separate collision domains, where fewer users
compete for bandwidth, thereby reducing collisions and increasing
Segmentation of repeaters is accomplished by internally isolating a repeater that
is interconnected to other repeaters via the Repeater Expansion Ports. You can
isolate any repeater in a stack by setting the SNMP variable that isolates a
repeater (nw2BkplNum=6) or by using VT100. When you isolate a repeater, it
occupies its own collision domain and is separate from the collision domain of
the repeaters that are still connected to the backplane. Isolating repeaters lets
you create up to 10 separate collision domains in a 10-repeater stack.
NOTE: You can view only the stack table for isolated repeaters. For complete
management, you must use a router or bridge to ensure proper connectivity. See
Chapter 4, "Administration and Management" for more information.
In Figure 3-10, Repeaters 1 through 3 are isolated from the other repeaters and
form Collision Domain 1. They are also cascaded together via the uplink switch
and standard twisted-pair cables. See the "Setting the Uplink Switch" section in
this chapter. Repeaters 4 and 5 are not isolated and form Collision Domain 2.
Netelligent 2008/2016 10Base-T Repeater User Guide