Alcatel OS6855-24 User Guide - Page 166
Redundant Stacking Cable Connection, Important.
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Stack Cabling Managing OmniSwitch 6855 Series Stacks Redundant Stacking Cable Connection OmniSwitches allow redundant stacking cable connections between the top-most and bottom-most switches in a stack. Important. For a stacked configuration to have effective redundancy, a redundant stacking cable must be installed between the upper-most and bottom-most switch in the chassis at all times. The figure below shows how the redundant connection between the top and bottom switches in the stack ensures that data will continue to flow throughout the stack, even in the event of a connection failure at one of the stacking cables. Stacking Cables Chassis Front Slot 1 Slot 2 Slot 3 Slot 4 1 Data enters slot 1 via Ethernet port. The data is passed to slot 2 over the stacking cable connection, then exits slot 2 via one of its Ethernet ports. Slot 1 Slot 2 Slot 3 Slot 4 2 The stacking connection between slots 1 and 2 goes down unexpectedly. Data can no longer travel directly between slot 1 and 2. However, because there is a redundant connection (the cable between slot 1 and slot 4), data is immediately passed to slot 4, then quickly traverses slot 3 and exits slot 2 to its destination. Stacking Cable Redundancy: Recovery Following a Stacking Link Failure page 7-18 OmniSwitch 6855 Series Hardware Users Guide September 2011