FAQs

SecureStack Clarification regarding the Stacking Cable/Port Connections

  • 1.  SecureStack Clarification regarding the Stacking Cable/Port Connections

    Posted 11-20-2013 23:37
    Article ID: 11977

    Products
    SecureStack C3, C2, B3, B2, A2

    Solution
    The Installation Guides state, in the 'Connecting High-Speed Stacking Cables' section:
    "Figure 3-6 shows an example of a four-high stack connected in a ring topology. All STACK DOWN and STACK UP connectors are used in the installation. The high-speed stacking cable (1) connections are from the STACK DOWN connector (2) of one device to the STACK UP (3) connector of the next device up in the stack. A high-speed stacking cable connection from the STACK DOWN (4) connector of the device at the top of the stack to the STACK UP (5) connector at the bottom of the stack completes the ring connection. In a daisy chain topology, the last connection is not made."

    The key point is that each interconnect cable (5834) is attached between a "STACK DOWN" port and a "STACK UP" port. Where the cabled switch units themselves are physically located in the stack is irrelevant to the stack functionality.

    However, to accommodate the human perspective - so that the hardware is ordered top-down the same way that a 'show version' or 'show switch' output would be (5780) - the units are generally connected in physical-stacking order as directed in the Installation Guides; the top-most unit is numbered 1 and the assigned numbers progress in ascending sequence generally as a result of the initial power-on sequence after cabling the stack (7086); and the top-most unit is the manager generally because it was the first to be powered on after cabling the stack (7086). But these are all organizational conventions rather than requirements.