Chapter 5
Setup and Configuration
RUGGEDCOM ROS
User Guide
172 Viewing STP Statistics for Ethernet Ports
This table displays the following information:
Parameter Description
Port(s) Synopsis:  Any combination of numbers valid for this parameter
The port number as seen on the front plate silkscreen of the switch
(or a list of ports, if aggregated in a port trunk).
Status Synopsis:  { Disabled, Listening, Learning, Forwarding, Blocking,
Link Down, Discarding }
Status of this port in Spanning Tree. This may be one of the
following:
• Disabled - STP is disabled on this port.
• Link Down - STP is enabled on this port but the link is down.
• Discarding - The link is not used in the STP topology but is
standing by.
• Learning - The port is learning MAC addresses in order to prevent
flooding when it begins forwarding traffic.
• Forwarding - The port is forwarding traffic.
Role Synopsis:  { , Root, Designated, Alternate, Backup, Master }
Role of this port in Spanning Tree. This may be one of the following:
• Designated - The port is designated for (i.e. carries traffic towards
the root for) the LAN it is connected to.
• Root - The single port on the bridge, which provides connectivity
towards the root bridge.
• Backup - The port is attached to a LAN that is serviced by another
port on the bridge. It is not used but is standing by.
• Alternate - The port is attached to a bridge that provides
connectivity to the root bridge. It is not used but is standing by.
• Master - Only exists in MSTP. The port is an MST region boundary
port and the single port on the bridge, which provides connectivity
for the Multiple Spanning Tree Instance towards the Common
Spanning Tree root bridge (i.e. this port is the root port for the
Common Spanning Tree Instance).
Cost Synopsis:  0 to 4294967295
Cost offered by this port. If the Bridge RSTP Parameters Cost Style
is set to STP, 1Gbps ports will contribute 4, 100 Mbps ports will
contribute 19 and 10 Mbps ports contribute a cost of 100. If the Cost
Style is set to RSTP, 1Gbps will contribute 20,000, 100 Mbps ports
will contribute a cost of 200,000 and 10 Mbps ports contribute a
cost of 2,000,000. Note that even if the Cost style is set to RSTP, a
port that migrates to STP will have its cost limited to a maximum of
65535.
RX RSTs Synopsis:  0 to 4294967295
The count of RSTP configuration messages received on this port.
TX RSTs Synopsis:  0 to 4294967295
The count of RSTP configuration messages transmitted on this port.
RX Configs Synopsis:  0 to 4294967295
The count of STP configuration messages received on this port.
TX Configs Synopsis:  0 to 4294967295
The count of STP configuration messages transmitted on this port.
RX Tcns Synopsis:  0 to 4294967295
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