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Control path: A path across stacking links dedicated to carrying control traffic such as commands to program hardware
or software image data for upgrades. A stack unit must join the control path to operate fully in the stack.
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Default ports: FastIron devices used the default-ports to define stacking port candidates. The stack default-ports
command is deprecated in Release 08.0.90. However, the default-ports are still used internally to define which ports can
be stacking ports. From Release 08.0.90, these ports are often referred to as valid-stack-ports or simply as stack-ports.
See also the term Valid-stack-port set.
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Direction: Every stack unit has one or two directions for linking to other units. Each direction is either a stack-port or
stack-trunk. System output, for example, in show commands, uses "D0" or "dir 0" to indicate the first direction.
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Dynamic configuration: A unit configuration that is dynamically learned by a new stack unit from the active controller. A
dynamic configuration disappears when the unit leaves the stack. The configuration becomes a static configuration after
you enter the write memory command.
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Interprocessor Communications (IPC): The process by which proprietary packets are exchanged between stack unit
CPUs.
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IronStack: A set of Ruckus stackable units (maximum of twelve) and their connected stacking links so that all units can be
accessed through their common connections. A single unit can manage the entire stack, and configurable entities, such
as VLANs and trunk groups, can have members on multiple stack units.
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Linear-topology trunk: A type of trunk available only in a two-unit stack to place stack-ports in both directions into a
single trunk. The resulting trunk achieves the same redundancy as a two-unit ring and doubles the bandwidth of the
stacking ports. All ports in the linear-topology trunk are used in forwarding between the two units, in contrast to a two-
unit ring, which uses only one direction, even when two paths are available. For ICX 7750 devices, a linear-topology trunk
may contain ports from two slots, for example, the configuration stack-trunk x/2/1 to x/2/6 x/3/1 to x/3/6. This feature
is available in FastIron release 08.0.90 and later. Refer to
Support for two-unit stack linear-topology trunks
on page 36.
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Non-Functioning stack unit: A stack unit that is recognized as a stack member, and is communicating with the active
controller over the Control Path, but is in a non-functioning state. A non-functioning stack unit will drop or discard traffic
from non-stacked ports. This may be caused by an image or configuration mismatch.
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Reserved / provisional unit: A unit configuration number that has no physical unit associated with it.
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Sequential connection: Stack unit IDs, beginning with the active controller, are sequential. For example, 1, 3, 4, 6, 7 is
sequential if active controller is 1. 1, 7, 6, 4, 3 are non-sequential in a linear topology, but become sequential in a ring
topology when counted from the other direction as: 1, 3, 4, 6, 7. Gaps in numbering are allowed.
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Stack interactive-setup: An interactive tool that assists in discovering units and constructing a stacking system. The stack
interactive-setup utility can also discover new links between existing stack units, enlarge a stacking trunk, or change a
chain topology to a ring. The utility also provides an option for users to change member IDs interactively.
NOTE
Ruckus recommends the use of stack interactive-setup in preference to stack zero-touch provisioning (stack
zero-touch-enable configuration) because the interactive-setup utility allows you more flexibility when
selecting units, assigning, IDs, or configuring a linear-topology trunk. Stack interactive-setup displays warning
messages about connection errors, making them easier to spot.
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Stack path: A data path formed across the stacking links to determine the set of stack members that are present in the
stack topology, and their locations in the stack.
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Stack slot: A slot in a stack is synonymous with a line model in a chassis.
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Stack topology: A contiguously-connected set of stack units in an ICX stack that are currently communicating with each
other. All units that are present in the stack topology appear in output from the show stack command.
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Stacking link: A cable that connects a stacking port on one unit to a stacking port on another unit.
Stacking Overview
Stacking terminology
Ruckus FastIron Stacking Configuration Guide, 08.0.90
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