Alcatel-Lucent OmniSwitch 6250-24M User Manual page 116

Roles Within the Stack
Primary
Secondary
!
Offline
Secondary
Offline
Primary
Secondary
Primary
page 6-6
Redundant Management Module Failover (Two Switches)
Managing OmniSwitch 6250 Stacks
1
A stack of two OmniSwitch 6250 switches is operating
normally. The stack consists of a primary module and a
secondary module. (The software on both elements in
the stack is synchronized.)
2
The primary management module fails or is taken
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.
OmniSwitch 6250 Hardware Users Guide June 2012