Dell PowerConnect FCS624S Configuration Guide - Page 139
Interprocessor Communications IPC, Non-Functioning Stack Unit
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IronStack overview 5 show, stack, and a few debug commands. When the stack is formed, all local consoles are directed to the Active Controller, which can access the entire CLI. The last line of output from the show version command indicates the role of a unit, unless it is a standalone unit, in which case it is not shown. For example: My stack unit ID = 1, bootup role = active • Clean Unit - A unit that contains no startup flash configuration or run time configuration. To erase old configuration information, enter the erase startup-config command and reset the unit. For PowerConnect B-Series FCX devices, the run-time configuration on a clean unit may also contain default-port information, • 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. • Default Port - PowerConnect B-Series FCX devices use the default-port command to define stacking port candidates. • Interprocessor Communications (IPC) - The process by which proprietary packets are exchanged between stack unit CPUs. • IronStack - A set of stackable units (maximum of eight) 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. • 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. Because of this state, traffic from the non-stack ports will not be forwarded into the stack - they will be dropped or discarded. This may be caused by an image or configuration mismatch. • 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. • Standalone Unit - A unit that is not enabled for stacking, or an Active Controller without any Standby Controller or stack members. • Stacking Link - A cable that connects a stacking port on one unit to a stacking port on another unit. • 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. • Stacking Port - A physical interface on a stack unit that connects a stacking link. Stacking ports are point-to-point links that exchange proprietary packets. Stacking ports must be 10 Gbps Ethernet ports, and cannot be configured for any other purpose while operating as stacking ports. Dell stacking units contain two ports that can be stacking ports. However, the flexible stacking port feature also allows you to use one port as a stacking port and the other port as a regular data port. Refer to "Controlling stack topology" on page 126. • Stack Slot - slot in a stack is synonymous with line module in a chassis. Table 22 shows the port and slot designations for PowerConnect stackable devices. • Stack Topology - A contiguously-connected set of stack units in an IronStack that are currently communicating with each other. All units that are present in the stack topology appear in output from the show stack command. PowerConnect B-Series FCX Configuration Guide 97 53-1002266-01
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