Alcatel-Lucent OmniSwitch 6850-48 Hardware User's Manual page 135

Managing OmniSwitch 6850 Series Stacks
Primary
Secondary
!
Offline
Secondary
Offline
Primary
Secondary
Primary
Redundant Management Module Failover (Two Switches)
OmniSwitch 6850 Series Hardware Users Guide
A stack of two OmniSwitch 6850 Series switches is
1
operating normally. The stack consists of a primary
module and a secondary module. (The software on both
elements in the stack is synchronized.)
The primary management module fails or is taken
2
offline (e.g., powered off or rebooted by the user).
The switch operating as the secondary management module
3
immediately takes over the primary role. It is at this point
essentially operating as a stand-alone switch.
4
If the switch that previously failed or was taken offline
comes back online, it will assume the secondary role in the
stack.
September 2009
Roles Within the Stack
page 4-5