PLANET SGSW-24040 - Manual (Page 321)

User’s Manual of SGSW-24040 / 24240 Series
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4.17 Stack
Using Stacking, it is possible to connect a number of switches together in a stack, which behaves as a single switch as seen
from outside the stack.
Two types of stack topologies are supported:
 Ring topology
 Chain topology (same as a disconnected ring)
Multiple PLANET SGSW series devices may be connected together to constitute a ring or chain stack topology using the STX /
5Gbps ports as interconnect links. Dedicated stacking features built into SGSW series makes all devices in the stack operate
together as a single, much larger switch. Among the stacking features are:
 Hardware controlled stack wide learning and continuous automatic MAC table synchronization
 Shortest path forwarding, providing low latency and optimal use of stacking link bandwidth
 QoS consistency across stack
 Single point of management for simple stack administration
 Low Cost and Flexible HDMI-like Stacking cables
 Real Plug and Play connectivity
The following figure shows an example with five devices in a ring topology stack. Each device in the stack is, in a stack context,
called a unit. The ports connecting the units are called stack ports, and the ports connecting to external hosts and switches are
called front ports.
Chain Stack: A chain of switches, that is, no redundant forwarding paths.
Figure 4-17-1 Chain Stack topology