Advantech EKI-9512-C0IDW10E, Руководство пользователя

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EKI-9500 Series User Manual 226
The following table describes the items in the previous figure.
4.4.19.6 Statistics
Use the Spanning Tree Statistics page to view information about the number and type
of bridge protocol data units (BPDUs) transmitted and received on each port.
Item Description
Interface The port or link aggregation group (LAG) associated with the rest of
the data in the row. When configuring CST settings for an interface,
this field identifies the interface being configured.
Port Role The role of the port within the CST, which is one of the following:

Root: A port on the non-root bridge that has the least-cost path to
the root bridge.

Designated: A port that has the least-cost path to the root bridge
on its segment.

Alternate: A blocked port that has an alternate path to the root
bridge.

Backup: A blocked port that has a redundant path to the same
network segment as another port on the bridge.

Master: The port on a bridge within an MST instance that links
the MST instance to other STP regions.

Disabled: The port is administratively disabled and is not part of
the spanning tree.
Port Forwarding
State

Blocking: The port discards user traffic and receives, but does
not send, BPDUs. During the election process, all ports are in the
blocking state. The port is blocked to prevent network loops.

Listening: The port sends and receives BPDUs and evaluates
information to provide a loop-free topology. This state occurs dur-
ing network convergence and is the first state in transitioning to
the forwarding state.

Learning: The port learns the MAC addresses of frames it
receives and begins to populate the MAC address table. This
state occurs during network convergence and is the second state
in transitioning to the forwarding state.

Forwarding: The port sends and receives user traffic.

Disabled: The port is administratively disabled and is not part of
the spanning tree.
Port Priority The priority for the port within the CST. This value is used in determin-
ing which port on a switch becomes the root port when two ports have
the same least-cost path to the root. The port with the lower priority
value becomes the root port. If the priority values are the same, the
port with the lower interface index becomes the root port.
Port Path Cost The path cost from the port to the root bridge.
Description A user-configured description of the port.
Refresh Click Refresh to update the screen.
Edit Click Edit to edit the selected entries.
Details Click Details to open a window and display additional information for
the selected interface.