Alcatel OS6850-48 User Guide - Page 183
Checking Redundant Stacking Cable Status
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Managing OmniSwitch 6850/6850E Series Stacks Stack Cabling Redundant stacking cables provide a form of dual redundancy. As shown in the figure above, the redundant cable allows traffic to flow in the event of a stacking link failure. The redundant cable also provides failover if a switch goes down within the stack. Traffic continues to flow between the modules that remain operational, as shown in the diagram below: Stacking Cables Chassis Front Slot 1 Slot 2 Slot 3 Slot 4 1 Data enters slot 1 through a 10/100/1000 Ethernet port. The data traverses slot 2 via the stacking cables and exits slot 3 through one of its 10/100/1000 Ethernet. Slot 1 Slot 2 Slot 3 Slot 4 2 The slot 2 switch goes down unexpectedly. Data can no longer move through slot 2. However, because there is a redundant connection (the cable between slot 1 and slot 4), data immediately traverses slot 4 and then exits slot 3 to its destination. Stacking Cable Redundancy: Recovery Following a Switch Failure within the Stack Checking Redundant Stacking Cable Status To check whether a redundant stacking cable connection exists between the top-most and bottom-most switches in the stack, use the show stack status command. For example: -> show stack status Redundant cable status Tokens used Tokens available : present : 12 : 20 In this example, a redundant stacking cable connection is present between the top-most and bottom-most switches in the stack. OmniSwitch 6850/6850E Series Hardware Users Guide June 2011 page 6-21