Figure 4.248Switching > Spanning Tree > Mst Port - Advantech EKI-9516P-HV User Manual

To access this page, click Switching > Spanning Tree > MST Port.
Figure 4.248 Switching > Spanning Tree > MST Port
The following table describes the items in the previous figure.
Item Description
MST ID The menu contains the ID of each MST instance that has been created
on the device.
Interface The port or link aggregation group (LAG) associated with the rest of
the data in the row. When configuring MST settings for an interface,
this field identifies the interface being configured.
Port Role The role of the port within the MST, which is one of the following:
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Port Forwarding
State
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Port Priority The priority for the port within the MSTI. 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.
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.
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.
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