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Managing Switches in a Stack Managing OmniSwitch 6600 Family Stacks
page 4-18 OmniSwitch 6600 Family Hardware Users Guide September 2006
Note. Before using the takeover command, verify that the switches in the stack are synchronized. Other-
wise, data flow and switch management functions may be interrupted due to incorrect or outdated soft-
ware when a switch takes over the primary CMM role. For more information, refer to “Synchronizing
Switches in a Stack” on page 4-17.
Stack Behavior During Takeover
If there are no unsaved configuration changes and the flash directories on both the primary and secondary
switches in a stack have been synchronized via the copy flash-synchro command, no modules will be
reloaded if a takeover occurs. As a result, data flow is not interrupted on the modules during the takeover.
If a configuration change is made to one or more modules (e.g., a VLAN is configured on several differ-
ent interfaces), and the changes are not saved via the write memory command, the corresponding modules
will automatically reload if a takeover occurs. Data flow on the affected modules will be interrupted until
the reload is complete. Note that the modules will reload whether or not the flash synchronization status
shows SYNCHRONIZED. This is because the unsaved changes have occurred in the running configura-
tion (i.e., RAM), and have not been written to the flash directory’s configuration file. In this case, a list of
only the affected modules displays in the table output (e.g., 1 6).
If the flash directories on the primary and secondary management modules are not synchronized (e.g., a
copy flash-synchro command has not been issued recently), all modules will be reloaded automatically if
a management module takeover occurs. Data flow will be interrupted on all modules until the reload is
complete.
Resetting All Switches in a Stack
To reset all switches in a stack you use the reload all command by entering
-> reload all
at the CLI prompt. This command can be helpful in restoring the original CMM roles in a stack (see
“CMM Role Redundancy” on page 4-5).