Spanning Tree/Bridge Status - i3 International S241 User Manual

Spanning Tree/Bridge Status

Using the Monitor menu to display Spanning Tree bridge status, CIST port status for physical ports of the current switch and
statistics for STP packets. Using STP Detailed Bridge Status page to display STA information on the global bridge and
individual ports.
LOCATION：Monitor>Spanning Tree>Bridge Status
Parameters:
Items
Bridge Instance
Bridge ID
Root ID
Root Port
Root Cost
Regional Root
Internal Root Cost
Topology Flag
Topology Change
Count
Topology Last
CIST Ports & Aggregations State
Port
Port ID
Role
State
Path Cost
Edge
Description
The Bridge instance - CIST, MST1, ...
The Bridge ID of this Bridge instance.
The Bridge ID of the currently selected root bridge.
The switch port currently assigned the root port role.
Root Path Cost. For the Root Bridge this is zero. For all other Bridges, it is the sum
of the Port Path Costs on the least cost path to the Root Bridge.
The Bridge ID of the currently selected regional root bridge, inside the MSTP
region of this bridge. (For the CIST instance only).
The Regional Root Path Cost. For the Regional Root Bridge this is zero. For all other CIST
instances in the same MSTP region, it is the sum of the Internal Port Path Costs on the least cost
path to the Internal Root Bridge. (For the CIST instance only).
The current state of the Topology Change Flag of this Bridge instance.
The number of times where the topology change flag has been set (during a one-second interval).
The time passed since the Topology Flag was last set.
The switch port number of the logical STP port.
The port id as used by the STP protocol. This is the priority part and the logical port index of the
bridge port.
The current STP port role. The port role can be one of the following values:
AlternatePort BackupPort RootPort DesignatedPort.
The current STP port state. The port state can be one of the following values:
Discarding Learning Forwarding.
The current STP port path cost. This will either be a value computed from the
Auto setting, or any explicitly configured value.
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.
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