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Chapter 8. Spanning Tree
Topology Flag
The current state of the Topology Change Flag of this Bridge instance.
Topology Change Count
The number of times where the topology change flag has been set (during a
one-second interval).
Topology Change Last
The time passed since the Topology Flag was last set.
CIST Ports & Aggregations State
Port
The switch port number of the logical STP port.
Port ID
The port id as used by the STP protocol. This is the priority part and the logical
port index of the bridge port.
Role
The current STP port role. The port role can be one of the following
values: AlternatePort BackupPort RootPortDesignatedPort.
State
The current STP port state. The port state can be one of the following
values: Discarding Learning Forwarding.
Path Cost
The current STP port path cost. This will either be a value computed from
the Auto setting, or any explicitly configured value.
Edge
The current STP port (operational) Edge Flag. An Edge Port is a switch port to
which no Bridges are attached. The flag may be automatically computed or
explicitly configured. Each Edge Port transits directly to the Forwarding Port
State, since there is no possibility of it participating in a loop.
Point-to-Point
The current STP port point-to-point flag. A point-to-point port connects to a
non-shared LAN media. The flag may be automatically computed or explicitly
configured. The point-to-point properties of a port affect how fast it can transit
to STP state.
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