Cisco SX350 Series Administration Manual page 140

Administration: Stack Management
Software Auto Synchronization in Stack
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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 state is by unplugging it from the
electrical source and plugging it back in. This operation must be preformed when an affected
unit is disconnected from the stack. After this operation, the affected unit mode can be
changed to the current stack mode and the unit can be rejoined to the stack.
Stack Unit Type
If a unit of one type (GE/FE/XG) is removed from the stack and replaced with a unit of
another type, the device attempts to apply the configuration of the previous unit to the new
unit. This usually succeeds, but there are exceptions as described below:
• Downlink port configuration—IF the stack included a unit of one type (for example
GE unit) and this unit is replaced by a unit of a different type (for example FE unit)
most of the port based configuration (VLANs, STP, ACL, 802.1x etc) are applied
automatically to the new port type. Some static port-type-related configuration will fail
and errors might be reported (for example if port speed was configured to 1GB, and
this port number in the new unit supports up to 100Mbps speed), but this will not cause
the rest of the configuration to fail. The failed commands remain part of the stack
running and startup configuration file, however upon system reload they will be
removed from new running configuration file.
• Uplink ports configuration—If the old and new unit types were changed between FE
and GE, the configuration matches both on the new and old unit types (since uplink
ports are always XG ports). Therefore, configuration of uplink ports are applied to new
units with no error.
When replacing an FE/GE device (which supports uplink port type) with an XG device (which
do not support uplink port type), the uplink port configuration on the newly-inserted XG
device is saved to a special interface type with ID of 49-52. This interface type is reserved to
indicate that the interface is not present.
When replacing a unit/interface type, the running and startup configuration files are modified
to correctly display the interface type. For example, if an old unit was an FE unit type with
interface ID FE1/0/1, when it is replaced with a GE unit type, the running/startup
configuration (and CLI show commands) automatically display the configuration under GE1/
0/1.
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