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If 0 (defined as the default CIST ID) is passed as the <0-4094>, then this command displays the
settings and parameters for a specific switch port within the common and internal spanning tree. The
<slot/port> is the desired switch port. In this case, the following are displayed.
Port Identifier: The port identifier for this port within the CST.
Port Priority: The priority of the port within the CST.
Port Forwarding State: The forwarding state of the port within the CST.
Port Role: The role of the specified interface within the CST.
Auto-calculate Port Path Cost: Indicate the port auto-calculate port path cost
Port Path Cost: The configured path cost for the specified interface.
Auto-calculate External Port Path Cost - Displays whether the external path cost is automatically
calculated (Enabled) or not (Disabled). External Path cost will be calculated based on the link speed
of the port if the configured value for External Port Path Cost is zero.
External Port Path Cost - The External Path Cost of the specified port in the spanning tree.
Designated Root: Identifier of the designated root for this port within the CST.
Designated Port Cost: Path Cost offered to the LAN by the Designated Port.
Designated Bridge: The bridge containing the designated port.
Designated Port Identifier: Port on the Designated Bridge that offers the lowest cost to the LAN.
Topology Change Acknowledgement: Value of flag in next Configuration Bridge Protocol Data Unit
(BPDU) transmission indicating if a topology change is in progress for this port.
Hello Time: The hello time in use for this port.
Edge Port: The configured value indicating if this port is an edge port.
Edge Port Status: The derived value of the edge port status. True if operating as an edge port; false
otherwise.
Point To Point MAC Status: Derived value indicating if this port is part of a point to point link.
CST Regional Root: The regional root identifier in use for this port.
CST Port Cost: The configured path cost for this port.
Transitions Into Loop Inconsistent State: The count number of transitions into loop inconsistent
state.
Transitions Out Of Loop Inconsistent State: The count number of transitions out of loop
inconsistent state.
This command displays the settings of one or all ports within the specified multiple spanning tree
instance. The parameter <0-4094> indicates a particular MST instance. The parameter {<slot/port> | all}
indicates the desired switch port or all ports.
If 0 (defined as the default CIST ID) is passed as the <0-4094>, then the status summary is displayed for
one or all ports within the common and internal spanning tree.
Syntax
show spanning-tree mst port summary <0-4094> {<slot/port> | all}