Alcatel-Lucent omni 6600 User Manual

Managing OmniSwitch 6600 Family Stacks

Managing Switches in a Stack

OmniSwitch 6600 Family Hardware Users Guide

page 4-17

“CMM” synchronization refers to the process of copying all files in the /flash/working and /flash/
certified directories of the switch with the primary Chassis Management Module (CMM) role to the 
/flash/working and /flash/certified directories of all the other switches in the stack. (This includes the 
switch with the secondary CMM role and all the switches with an idle CMM role.)

This synchronization process ensures that these directories match exactly for all switches in the stack. 
Synchronization prevents any switch in the stack from assuming the primary role with incorrect or 
outdated software or configuration files.

Important. In order to have effective redundancy, switches in the stack must be synchronized at all times. 

To synchronize the switches in the stack, enter the following command at the CLI prompt:

-> copy working certified flash-syncro

For more information on CMM synchronization and managing the /flash/working and /flash/certified 
directories, refer to the “Managing CMM Directory Content” chapter in the OmniSwitch 6600 Family 
Switch Management Guide.

To change a switch with a secondary role to primary use the 

 command. For example, while 

logged into either the primary or secondary switch enter:

-> takeover

at the CLI prompt. In a stack consisting of two switches the primary switch will become secondary. In a 
stack consisting of three or more switches the secondary switch will become primary, the idle switch with 
lowest slot number will become secondary, and the switch that was primary will become idle.

You can determine the current CMM role of a switch by examining the PRI and SEC LEDs on the 
switch’s front panel. Refer to 

 

for more information. You can also use the 

 command to display whether the 

switch into which you are currently logged is primary or secondary. For example:

-> show running-directory

CONFIGURATION STATUS

Running CMM              : PRIMARY,

CMM Mode                 : DUAL CMMs,

Current CMM Slot         : 1,

Running configuration    : WORKING,

Certify/Restore Status   : CERTIFY NEEDED

SYNCHRONIZATION STATUS

Flash Between CMMs       : SYNCHRONIZED,

Running Configuration    : NOT AVAILABLE,

Stacks Reload on Takeover: ALL STACKs (SW Activation)

In this example, the user is currently logged in to the switch with the primary CMM role.