Alcatel-Lucent OmniSwitch 6850E Series Hardware User's Manual page 164

Changing the Secondary Module to Primary
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
-> takeover
Booting...
Primary - Slot 2
Secondary - Slot 1
Primary - Slot 2
page 6-36
1
In this stack of two switches, the slot 1 switch is the primary man-
agement module. The slot 2 switch is the secondary.
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.
The secondary switch takes over the primary role. Ethernet traffic
3
on slot 2 remains unaffected. Meanwhile the stack has no interim
secondary management module as the switch reboots.
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
OmniSwitch 6850E Series Hardware Users Guide
Managing OmniSwitch 6850E Series Stacks
January 2013