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User Manual
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Bridge ID
The Bridge ID of this Bridge instance.
Root ID
The Bridge ID of the currently elected root bridge.
Port
The switch port currently assigned the root port role.
Root Cost
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.
Regional Root
The Bridge ID of the currently elected regional root bridge, inside the MSTP region of
this bridge. (For the CIST instance only).
Internal Root Cost
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).
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
6.12.6.2 CSTI port and aggregation state
Port
The switch port number.
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.