Changing the Secondary Module to Primary
Managing OmniSwitch 6350 Stacks
page 7-34
OmniSwitch 6350 Hardware Users Guide
April 2017
Changing the Secondary Module to Primary
OmniSwitch 6350 stacks allow users to manually force the secondary switch to assume the primary
management role. This is referred to as “takeover.” The behavior of a takeover is similar to that of
reloading the primary management module (see
Whenever a takeover is initiated, the switch with the secondary role automatically takes over primary
management functions. The primary switch is automatically reloaded and any traffic being passed on the
primary switch’s Ethernet is interrupted.
Meanwhile, the idle switch with the next-lowest slot number automatically assumes the secondary role.
When the former primary module comes back up, it assumes an idle role within the stack.
To initiate a takeover sequence, use the
command. For example:
-> takeover
Note.
Before using the
takeover
command, verify that the switches in the stack are synchronized.
Otherwise, data flow and switch management functions may be interrupted due to incorrect or outdated
software when a switch takes over the primary management role. For more information, refer to
“Synchronizing Switches in a Stack” on page 7-36
Takeover Behavior In a Stack of Three or More
In this stack of four OmniSwitch 6350 switches, the slot
1 switch is the primary management module. The slot 2
switch is the secondary. Slots 3 and 4 are operating in
idle roles.
A takeover is initiated by the user; the primary manage-
ment module is automatically reloaded. Any data flow on
the primary switch’s Ethernet is interrupted.
The secondary switch takes over the primary role. The idle
switch with the next-lowest slot number—in this case, slot
3—automatically becomes the secondary management
module. The slot 4 switch remains unaffected. In addition,
Ethernet traffic on slots 2, 3, and 4 remains unaffected.
1
2
3
-> takeover
Primary - Slot 1
Secondary - Slot 2
Idle - Slot 3
Idle - Slot 4
Booting...
Primary - Slot 2
Secondary - Slot 3
Idle - Slot 4
When the former primary switch comes back up, it
assumes an idle role within the stack.
4
Idle - Slot 1
Primary - Slot 2
Secondary - Slot 3
Idle - Slot 4
