Alcatel-Lucent 6850-48 硬件手册

Synchronizing Switches in a Stack

Managing OmniSwitch 6850 Series Stacks

page 4-36

OmniSwitch 6850 Series Hardware Users Guide

Management module synchronization refers to the process of copying all files in the /flash/working and 
/flash/certified directories of the primary management module to the /flash/working and /flash/certified 
directories of all the other switches in the stack. The system and configuration software on the non-
primary switches—i.e., the secondary management module and any modules operating in idle—is over-
written.

The synchronization process ensures that the contents of these directories match exactly for all switches 
across the stack. This can be especially useful after new software has been loaded to the primary manage-
ment module. Further, synchronization prevents any switch from assuming a management role within the 
stack with incorrect or outdated software or configuration files. Because the primary switch’s “last known 
good” software is propagated to all switches, the synchronization process helps ensure effective redun-
dancy across the stack.

In order to maintain effective management module redundancy, switches in the stack must be synchro-
nized at all times. To determine whether a stack is in need of synchronization, use the 

 command. For example:

-> show running-configuration

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       : NOT SYNCHRONIZED,
   Running Configuration    : NOT AVAILABLE,
   Stacks Reload on Takeover: PRIMARY ONLY

This example shows a switch on which the /flash directories between the management modules are not 
synchronized. To manually synchronize all switches in the stack, enter the following command:

-> copy working certified flash-syncro

When the synchronization process is initiated, modules within the stack continue to operate without inter-
ruption and data flow across the stack is unaffected.

If the checksum value on the stack’s non-primary switches differs in any way from the checksum value on 
the primary switch, the primary switch automatically distributes its system and configuration software to 
all other switches in the stack whenever a full reload is executed. 

For more information on initiating a full reload, see 

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