Microsens MS453490M Management Guide - Manual (Page 207)

C HAPTER 8 | Spanning Tree Algorithm
Displaying Interface Settings for STA
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D ISPLAYING I NTERFACE S ETTINGS FOR STA
Use the Spanning Tree > STA (Configure Interface - Show Information)
page to display the current status of ports or trunks in the Spanning Tree.
CLI R EFERENCES
◆ "show spanning-tree" on page 779
P ARAMETERS
These parameters are displayed:
◆ Spanning Tree – Shows if STA has been enabled on this interface.
◆ STA Status – Displays current state of this port within the Spanning
Tree:
■
Discarding - Port receives STA configuration messages, but does
not forward packets.
■
Learning - Port has transmitted configuration messages for an
interval set by the Forward Delay parameter without receiving
contradictory information. Port address table is cleared, and the
port begins learning addresses.
■
Forwarding - Port forwards packets, and continues learning
addresses.
The rules defining port status are:
■
A port on a network segment with no other STA compliant bridging
device is always forwarding.
■
If two ports of a switch are connected to the same segment and
there is no other STA device attached to this segment, the port with
the smaller ID forwards packets and the other is discarding.
■
All ports are discarding when the switch is booted, then some of
them change state to learning, and then to forwarding.
◆ Forward Transitions – The number of times this port has transitioned
from the Learning state to the Forwarding state.
◆ Designated Cost – The cost for a packet to travel from this port to the
root in the current Spanning Tree configuration. The slower the media,
the higher the cost.
◆ Designated Bridge – The bridge priority and MAC address of the
device through which this port must communicate to reach the root of
the Spanning Tree.
◆ Designated Port – The port priority and number of the port on the
designated bridging device through which this switch must
communicate with the root of the Spanning Tree.