User`s guide

AT-S39 User’s Guide
275
Port Cost
The spanning tree algorithm uses the cost parameter to decide
which port provides the lowest cost path to the root bridge for
that LAN. The range is 0 to 20 000 000. The default setting is Auto-
detect, which sets port cost depending on the speed of the port.
Default values are 100 for a 10 Mbps port, 10 for a 100 Mbps port,
and 4 for a 1 Gbps port.
MCHECK
This option instructs the bridge to send out RSTP BPDU packets
for several seconds from the selected port. The purpose is to
determine if there are any RSTP or STP bridges connected to the
port. If the port receives STP BPDU packets in response, the port
changes to STP compatible mode.
Point-to-Point
This parameter defines whether the port is functioning as a point-
to-point port. For an explanation of this parameter, refer to Point-
to-Point Ports and Edge Ports on page 102.
Edge Port
This parameter defines whether the port is functioning as an edge
port. For an explanation of this parameter, refer to Point-to-Point
Ports and Edge Ports on page 102.
6. Once you have configured the parameters, click Apply.
Note
All changes to a port’s RSTP settings, with the exception of port cost,
are activated immediately. A change to the port cost value requires
you to reset the switch. A new port cost value is not implemented
until the unit is reset.