LevelOne GSW-1676, User Manual

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RSTP
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Displaying RSTP Status
Use the RSTP Status page to display global and port-specific status and
attribute settings for the Rapid Spanning Tree Protocol.
Field Attributes
RSTP Bridge Overview
• Hello Time – Interval (in seconds) at which the root device transmits a
configuration message.
• Max Age – The maximum time (in seconds) a device can wait without
receiving a configuration message before attempting to reconfigure. All
device ports (except for designated ports) should receive configuration
messages at regular intervals. Any port that ages out STA information
(provided in the last configuration message) becomes the designated
port for the attached LAN. If it is a root port, a new root port is selected
from among the device ports attached to the network.
• Fwd Delay – The maximum time (in seconds) the root device will wait
before changing states (i.e., discarding to learning to forwarding). This
delay is required because every device must receive information about
topology changes before it starts to forward frames. In addition, each
port needs time to listen for conflicting information that would make it
return to a discarding state; otherwise, temporary data loops might result.
• Topology – Shows if STP topology is stable or undergoing changes.
• Root ID – The priority and MAC address of the device in the Spanning
Tree that this switch has accepted as the root device, and the port
connected to the root device.
RSTP Port Status
• Port/Trunk - The number of a port or the ID of a static trunk.
• Path 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.
• Edge Port – Shows if this port is functioning as an edge port, either
through manual selection (see the RSTP Port Configuration table) or
auto-detection. Note that if the switch detects another bridge connected