Alaxala AX2200S Series Configuration Manual page 324

19 Spanning Tree Protocol
corresponding port on the Switch because the port keeps pace with the remote port during
this mode.
Combinations of Spanning Tree Protocols that can be used on the Switch and the partner
switch are shown in the following figure.
Figure 19-5 Relationship of the switch operations in STP compatibility mode
Under STP compatibility mode operation, high-speed transitions can no longer be
performed on the corresponding port, requiring more time for communication to be
restored.
The Switch supports automatic-restoration and forced restoration of a rapid Spanning Tree
Protocol.
(2) Restoration functionality
(a) Automatic-restoration functionality
Automatic-restoration returns the Switch from STP compatibility mode operation to rapid
Spanning Tree operation if the partner switch changes to a rapid Spanning Tree switch
during operation in STP compatibility mode.

The automatic STP compatibility mode recovery functionality operates if the link type
of the corresponding port is point-to-point.

If the corresponding port is a non-designated port
mode, an RST BPDU or MST BPDU can be sent from the corresponding port to
disable STP compatibility mode.
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
If the link type of the corresponding port is shared, automatic-restoration mode does
not run, because it cannot run correctly.
Depending on the timing of the restoration, the corresponding port and the partner switch
continue running in STP compatibility mode.
(b) Forced restoration functionality
The forced restoration functionality performs forced restoration for ports running in STP
compatibility mode, allowing them to perform high-speed transitions normally.
This functionality executes the
command to perform forced restoration from STP compatibility mode. The link type of the
corresponding port can be either point-to-point or shared.
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For details about non-designated ports, see Table 19-6 Port role in 19.1.4 (2)
Port role.
clear spanning-tree detected-protocol
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running in STP compatibility
operation