Alcatel OS6855-24 User Guide - Page 184
Takeover Behavior In a Stack of Two, If there are only two switches in the stack
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Changing the Secondary Module to Primary Managing OmniSwitch 6855 Series Stacks If there are only two switches in the stack, the former primary switch resumes the secondary role when it comes back up following the takeover. Primary - Slot 1 Secondary - Slot 2 1 In this stack of two OmniSwitches, the slot 1 switch is the primary management module. The slot 2 switch is the secondary. -> takeover Booting... Primary - Slot 2 2 A takeover is initiated by the user; the primary management module is automatically reloaded. Any data flow on the primary switch's Ethernet is interrupted. 3 The secondary switch takes over the primary role. Ethernet traffic on slot 2 remains unaffected. Meanwhile the stack has no interim secondary management module as the switch reboots. Secondary - Slot 1 Primary - Slot 2 4 When the former primary switch comes back up, it assumes the secondary management role within the stack. Takeover Behavior In a Stack of Two page 7-36 OmniSwitch 6855 Series Hardware Users Guide September 2011