Specifications

183
DCS-3950 series Ethernet switch manual
Usage Guide: When a port is set to be a boundary port, the port converts its status from
discarding to forwarding without bearing forward delay. Once the boundary port receives
the BPDU, the port becomes a non-boundary port.
Example: Set port 0/0/2 as boundary ports.
Switch(Config)#interface ethernet 0/0/2
Switch(Config-Ethernet-0/0/2)#spanning-tree portfast bpdufilter
Switch(Config-Ethernet-0/0/2)#
10.2.2.20 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.
Parameters：
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：Privacy 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 privacy packet format is set by default in
the concern of better compatibility with previous products and the leading companies. Also
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
not match the configured format, we set the state of the port which receives the
unmatched packet to DISCARDING to prevent both sides consider themselves the root
which leads to circuits.
When the AUTO format is set, and over one equipment which is not compatible with
each other are connected on the port (e.g. a equipment running through a HUB or
Transparent Transmission BPDU is connected with several equipments running MSTP),
the format alter counts will be recorded and the port will be disabled at certain count
threshold. The port can only be re-enabled by the administrator.
Example: Switch(config)#interface ethernet 0/0/2
Switch(Config)#interface ethernet 0/0/2
Switch(Config-Ethernet-0/0/2)#spanning-tree format standard
Switch(Config-Ethernet-0/0/2)#