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12.1.20 spanning-tree priority
Command: spanning-tree priority <bridge-priority>
no spanning-tree priority
Function: Configure the spanning-tree priority; the ―no spanning-tree priority‖
command restores the default priority.
Parameter: <bridge-priority> is the priority of the bridging switch. Its value should be
round times of 4096 between 0 and 61440, such as 0, 4096, 8192… 61440.
Command Mode: Global Mode.
Default: Priority is 32768.
Usage Guide: The bridge ID can be altered by changing the priority of the switch. Further,
the priority information can also be used for voting of the root bridge and the specified
ports. The bridge priority value of the switch is smaller, however the priority is higher.
Example: Configure the priority is 4096.
Switch(config)#spanning-tree priority 4096
12.1.21 spanning-tree format
Command: spanning-tree format {standard | privacy | auto}
no spanning-tree format
Function: Configure the format of the port packet so to be interactive with products of
other companies. The no command restores the default format.
Parameter: standard：The packet format provided by IEEE
privacy：Privacy packet format, which is compatible with CISCO equipments.
auto：Auto identified packet format, which is determined by checking the
format of the received packets.
Default: Auto Packet Format.
Command Mode: Port Mode
Usage Guide: As the CISCO has adopted the packet format different with the one
provided by IEEE, while many companies also adopted the CISCO format to be CISCO
compatible, we have to provide support to both formats. The standard format is originally
the one provided by IEEE, and the privacy packet format is CISCO compatible. In case we
are not sure about which the packet format is on partner, the AUTO configuration will be
preferred so to identify the format by the packets they sent. The AUTO packet format is set
by default in the concern of better compatibility with previous products and the leading
companies. The packet format will be privacy format before receiving the partner packet
when configured to AUTO.
When the format is not AUTO and the received packet format from the partner does
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