Spanning Tree
Defining MSTP Interface Settings
Cisco Small Business 300 Series Managed Switch Administration Guide 230
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STEP 5 Enter the parameters.
•Instance ID—Select the MST instance to be configured.
•Interface—Select the interface for which the MSTI settings are to be
defined.
•Interface Priority—Set the port priority for the specified interface and MST
instance.
•Path Cost—Set the port contribution to the root path cost or use the default
value.
•Port State—Displays the MSTP status of the specific port on a specific MST
instance. The parameters are defined as:
-Disabled—STP is currently disabled.
-Blocking—The port on this instance is currently blocked, and cannot
forward traffic (with the exception of BPDU data) or learn MAC
addresses.
-Listening—The port on this instance is in Listening mode. The port cannot
forward traffic, and cannot learn MAC addresses.
-Learnin g—The port on this instance is in Learning mode. The port cannot
forward traffic, but it can learn new MAC addresses.
-Forwardi ng—The port on this instance is in Forwarding mode. The port
can forward traffic and learn new MAC addresses.
-
Boundary—The port on this instance is a boundary port. It inherits its
state from instance 0 and can be viewed on the STP Interface Settings
page.
•Port Role—Displays the port or LAG role, per port or LAG per instance,
assigned by the MSTP algorithm to provide STP paths:
-Root—Forwarding packets through this interface provides the lowest
cost path for forwarding packets to the root device.
-Designated—The interface through which the bridge is connected to the
LAN, which provides the lowest root path cost from the LAN to the Root
Bridge for the MST instance.
-Alternate—The interface provides an alternate path to the root device
from the root interface.