Administration: Stack Management
Stack Unit Mode
Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3 72
5
Consistency of Stack Unit Modes in the Stack
All units in the stack must have the same Stack Unit mode.
When the stack is initialized, it runs a topology discovery algorithm that collects
information on the units of the stack.
After a unit is selected to become the master, it can reject its neighbor’s request to
join the stack if it has an inconsistent Stack Unit mode. When a unit is rejected
because of its Stack Unit mode, it is logically shutdown (the ports cannot send/
receive traffic) and all its LEDs (system, FAN, unit IDs, network ports and stack
ports LEDs) are turned on. The information regarding the Stack Unit mode is
displayed as a SYSLOG error in the master unit.
Note that the only way for the unit to recover from this mode is by unplugging its
electricity and plugging it back in.
Changing the Stack Unit Mode
Change the Stack Unit mode of a device to remove it from a stack (by changing its
Stack Unit mode to Standalone), or when configuring it to become part of a stack
(by changing its Stack Unit mode to Native Stacking, Basic Hybrid Stacking or
Advanced Hybrid Stacking).
The following sections describe the System mode and configuration of the
devices after reboot when the Stack Unit mode is changed.
System Mode (Sx500 Devices) After Reboot
When the Stack Unit mode of a device is changed, the System mode of the device
is as follows after reboot:
• Sx500 devices—The System mode (Layer 2 or Layer 3) of the backup and
slave Sx500 units is taken from the master-enabled unit. If the System mode
is not specifically set before reboot, it is Layer 2 after reboot (this is the
default). If you want the device to be in Layer 3 mode after reboot, this must
be specifically set before reboot.
• SG500X devices—If the device is in Standalone or Native Stacking mode,
its System mode is always Layer 2 and 3. When the device is in Basic or
Advanced Hybrid mode, it behaves as described above for Sx500 devices.
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