Note that, while a physical ring connection may be present, a ring active topology exists only when all
nodes in the stack are active.
Daisy Chain Topology: Not Recommended for Stacking
Stackable switches can be connected in a daisy-chain topology. This is a ring topology with one of the
links disconnected, inoperative, or disabled. A daisy chain can be created when a link fails or a node
reboots in a ring topology, but the daisy chain topology is not recommended for normal operation.
Connect your stack nodes in a ring topology, not a daisy-chain topology, for normal operation.
In Figure 21, the nodes delineated as the active topology are operating in a daisy-chain configuration,
even though there is physically a ring connection in the stack.
Figure 21: Daisy Chain Topology
You might need to use a daisy chain topology while adding a new node, removing a node, or joining two
stacks.
If you are using a daisy chain topology, the possibility of a dual primary condition increases. Before you
create a daisy chain topology, read "Managing a Dual Primary Situation" in the Switch Engine 32.1 User
Guide.
SummitStack Topologies
Build Stacks
44 ExtremeSwitching 5720 Series Hardware Installation Guide
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