Cisco Systems SG50028PK9NA Manual De Usuario

Software Auto Synchronization in Stack

Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 

70

After failover, if the original master is connected again, the master selection 
process is performed. If the original master (unit 1) is reselected to be the master, 
the current master (unit 2, which was the original backup unit) is rebooted and 
becomes the backup once again. 

During master/backup failover, the up time of the backup unit is retained.

All the units in the stack must run the same software version (firmware and 
bootcode). Each unit in a stack automatically downloads firmware and bootcode 
from the master unit if the firmware and/or boot code that the unit and the master 
are running is different. The unit automatically reboots itself to run the new version.

The stack unit mode of a device indicates whether it can be part of a stack or 
whether it is operating on its own.

Devices can operate in one of the following stack unit modes:

•

Standalone—A device in Standalone stack unit mode is not connected to 
any other device and does not have a stack port.

•

Native Stacking—A device in Native Stacking mode can be connected to 
other devices of the same type through its stack ports to form a stack. All 
units in a native stack must be of the same type (either all Sx500s, all 
SG500Xs/ESW2-550Xs or all SG500XGs).

•

Basic Hybrid—A device in Basic Hybrid mode can be connected to 
Sx500and SG500X/ESW2-550X devices to form a stack. The only limitation 
(and the reason that this mode is called Basic Hybrid as opposed to 
Advanced Hybrid) is that there is no support for VRRP or RIP. In this mode, 
the GUI displays the pages of Sx500, even if the stack master is a SG500X/
ESW2-550X, since the feature set is that of the Sx500. 

In this mode, any type of device can take the master/backup roles. Only the 
5G stacking ports can be used as stack ports.