Alcatel OS6850-P48 User Guide - Page 201

Managing OmniSwitch 6850/6850E Series Stacks Synchronizing Switches in a Stack Synchronizing Switches in a Stack 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 nonprimary switches-i.e., the secondary management module and any modules operating in idle-is overwritten. 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 management 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 Further, synchronization prevents any switch from assuming a management role within the stack with incorrect or outdated software or configuration files.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 redundancy across the stack. In order to maintain effective management module redundancy, switches in the stack must be synchronized at all times. To determine whether a stack is in need of synchronization, use the show runningdirectory 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 interruption and data flow across the stack is unaffected. Automatic Synchronization During a Full Reload 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 "Reloading All Switches in a Stack" on page 6-34. 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. OmniSwitch 6850/6850E Series Hardware Users Guide June 2011 page 6-39