Alcatel OS6850-P48 User Guide - Page 200
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 6850/6850E 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 switches, the slot 1 switch is the primary man- agement 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 6-38 OmniSwitch 6850/6850E Series Hardware Users Guide June 2011