Stack-mode DToR configurations
Each unit has a pair of FI-up and FI-down ports. You can connect the units for Stack-mode
Distributed Top-of-Rack (DToR) using a pair of FI ports, and FI cables. The Stack type and unit
numbering depends on the FI cabling configuration and the Base unit position within the Stack.
Stack-mode DToR is the default operation of the FI ports on the VSP 7000 Series.
You must always connect an FI-up port to an FI-down port, or an FI-down port to and FI-up port on
adjacent units. You must also always connect the two FI cables top to top and bottom to bottom on
adjacent units. The following figure shows a simple non-redundant FI cabling connection in a Stack
of two units.
Figure 18: Non-redundant FI cabling simple diagram
Note:
The following sections describe FI-down and FI-up configurations, showing vertical Stack
example diagrams. The FI cabling for a Stack-mode DToR also requires an FI-up or FI-down
cable configuration. Stack-mode DToR is typically a horizontal deployment of one unit at the top
of each equipment rack, spanning across up to eight racks.
FI-down configuration
In a FI-down configuration, the Base unit is physically located at the top of the Stack. The software
automatically numbers the physical units based on the designated Base unit (unit 1). The FI cables
connected to the FI-down ports of the Base unit terminates in the FI-up ports on the next unit in the
Stack, located below the Base unit. The next unit is designated unit 2. The Stack is wired downward
though the units and the software continues to number down through the Stack. In this
configuration, the Base unit discovers the Stack in a FI-down direction. The following figure shows a
typical FI-down configuration.
Fabric Interconnect connectivity
42 Installing Avaya VSP 7000 Series August 2014
Comments? infodev@avaya.com
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