Manual

105
Switch Configuration SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
➽ Note:
For
SmartStack STS16-20D n/a
will be displayed for ports 1 to 16 as they
do not support spanning tree protocol.
Path Cost
Cost associated with the port. The spanning tree protocol uses port path costs to
determine which port to select as a forwarding port. Therefore, lower numbers
should be assigned to ports attached to faster media (such as FDX or CrossLink),
and higher numbers should be assigned to ports attached to slower media. The
possible range is 1 to 65,535. The default is 62. The recommended path cost is
1000
/
LAN speed in Mbps.
➽ Note:
For SmartStack STS16-20D, the text
n/a
will be displayed for ports 1 to 16
as they do not support spanning tree protocol.
STP Mode
The port’s spanning tree mode. Possible values are
forwarding
,
blocked
, and
auto
.
When
auto
is selected, the spanning tree protocol will be used to determine the
forwarding/blocking state.
When set to
blocked
, the port will not forward any frames.
When set to
forwarding
, the port will always forward frames.
On SmartStack STS16-20D ports 1 to 16 will always be in
forwarding
state.
If the port is used to connect to a single station, forwarding might be the preferred
mode since it might take 30 seconds or more before a port is opened until it starts
forwarding frames. If connected to a shared media or a bridge, be careful not to
create loops.
More
To view more ports in the table.
Change
To change or add values to specific ports.
Current Spanning Tree Information Screen
A summary of STP information for each port is available from the “Current
Spanning Tree Information” screen. See Chapter 7, “Monitoring the Network from
the Console Statistics Menu” on page 185 for more information.