PLANET WGSW-52040 - Manual (Page 332)

19-101
Command Mode:
Port Mode
Default:
Auto Packet Format.
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 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:
Configure port message format as the message format of IEEE. Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#spanning-tree format standard
Switch(Config-If-Ethernet1/2)#
19.1.12 spanning-tree forward-time
Command:
spanning-tree forward-time
no spanning-tree forward-time
Function:
Set the switch forward delay time; the command “no spanning-tree forward-time” restores the default setting.
Parameter:
is forward delay time in seconds. The valid range is from 4 to 30.