LevelOne GTL-2691 - Manual (Page 88)

C HAPTER 2 | Initial Switch Configuration
Stack Operations
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other units within this VLAN interface, then this IP address will no longer be
available. To retain a constant IP address for management access across
fail over events, you should include port members on several units within
the primary VLAN used for stack management.
R ESILIENT C ONFIGURATION
If a unit in the stack fails, the unit numbers will not change. This means
that when you replace a unit in the stack, the original configuration for the
failed unit will be restored to the replacement unit. This applies to both the
Master and Slave units.
R ENUMBERING THE
S TACK
The startup configuration file maps configuration settings to each switch in
the stack based on the unit identification number. If the units are no longer
numbered sequentially after several topology changes or failures, you can
reset the unit numbers using the “Renumbering” command in the web
interface or CLI. Just remember to save the new configuration settings to a
startup configuration file prior to powering off the stack Master.
E NSURING
C ONSISTENT C ODE IS
USED ACROSS THE
S TACK
Consistent Runtime Code in Each Switch – The main board runtime
firmware version for each unit in the stack must be the same as the Master
unit’s runtime firmware. After Auto-ID assignment is completed, the
Master unit checks the image versions for consistency. If the firmware
versions (i.e., runtime code) configured for bootup on any slave units are
not the same as those on the Master Unit, the stack will operate in Special
Stacking Mode in which all backup units are disabled as described below:
◆ The master unit starts normal operation mode in standalone mode.
◆ The master unit can see all units in the stack and maintain stack
topology.
◆ None of the other units can function (all ports will be disabled).
◆ All user-initiated commands to configure the non-functioning units are
dropped. The master unit, however, will be able to communicate the
following information to the non-functioning units:
■
Image downloads
■
Stack topology information
■
System configuration information already stored on the master.
In Special Stacking mode, the master unit displays warning messages
whenever you log into the system through the CLI that inform you that an
image download is required.
You can use the CLI, web or SNMP to download the runtime image from a
TFTP server to the master unit. The master unit stores the image as its
“Next boot image” and downloads the image to those backup units that are