Alcatel OS6855-24 User Guide - Page 160
Idle Module Role, Note., Secondary Management Module Selection Using Saved Slot Information
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Roles Within the Stack Managing OmniSwitch 6855 Series Stacks Idle Module Role Switches that are not assigned either the primary or secondary role in a stack are, by default, assigned the role of idle modules. These idle modules operate similarly to Network Interface (NI) modules in a chassisbased switch. It is the job of idle modules to send and receive traffic. In the event of a management module failure within the stack, the idle module with the next lowest slot number in the stack will automatically assume the secondary management role. In other words, if the primary module in a stack goes down for any reason and the secondary takes over the primary management role, the switch must now assign a new secondary module. The idle element with the next lowest slot number assumes this new responsibility until the situation is corrected and all elements in the stack are reloaded. Note. Primary and secondary management modules also send and receive traffic on their Ethernet. The primary management module is like an NI module with the added task of overall stack management; the secondary management module is like an NI with the added responsibility of backing up the primary module in the event of a primary module failure. In other words, all modules in the virtual chassis can send and receive user data, regardless of their roles. For more information on dynamic assignment of idle modules in a stack, refer to the diagram below: 1 Four OmniSwitches are stacked; all switches are connected via stacking cables. The stack is booted. Primary Secondary Idle Idle Primary Secondary 2 The primary and secondary management modules are dynamically assigned using any of the methods outlined on pages 7-7 through 7-11. 3 The system software automatically assigns the remaining elements in the stack the idle module role. These modules act as Network Interface (NI) modules. In the event of a primary-to-secondary failover, the idle module with the next-lowest slot number in the stack will assume the secondary-or backup-management role. Secondary Management Module Selection Using Saved Slot Information page 7-12 OmniSwitch 6855 Series Hardware Users Guide September 2011