Renumbering a SecureStack Manager Unit Results in Configuration Loss

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Article ID: 10749 

Products
SecureStack C3, C2, B3, B2, A2 

Changes
Renumbered a switch unit which is serving as the stack's Mgmt Switch. 

Symptoms
Upon execution of the renumber operation, the stack lost its user configurations. 

Cause
If the current Mgmt Switch (per a 'show switch' query) is directly renumbered to a different unit number using the 'set switch renumber...' command, this will reset the Stack Configuration back to default values. 

Solution/Workaround
Functions as Designed (FAD) 

Workaround: Renumbering a Mgmt Switch should only be done indirectly. 

There are two general scenarios which may be encountered:
 
    Scenario-   The desired manager unit number is presently assigned to a non-manager unit.
    Example-    Unit numbers are 1, 2, and 3; 3 is the manager; and 1 should be the manager.
    Procedure- Reassign the management role from unit 3 to unit 1.
     C2(su)->set switch movemanagement 3 1

Moving stack management will unconfigure entire stack including
all interfaces.
Are you sure you want to move stack management? (y/n) y

    Scenario-   The desired manager unit number is presently Unassigned or non-existing.
    Example-    Unit numbers are 2 and 3; 3 is the manager; and 1 should be the manager.
    Procedure- Renumber non-manager unit 2 to the desired manager unit 1,
                       then reassign the management role from unit 3 to unit 1.
         C3(su)->set switch renumber 2 1
    C2(su)->set switch movemanagement 3 1

    Moving stack management will unconfigure entire stack including
    all interfaces.
    Are you sure you want to move stack management? (y/n) y

    Note: The 'set switch movemanagement' command is disruptive! All stack traffic handling is suspended until the transfer process is complete (perhaps 20-40 seconds, depending upon the configuration complexity). 

    See also: 7086.
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