Lantech LGS-2816C-RPS, User Manual

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in the same MST region.The first case indicates that the root port‘s
owner is the CIST regional root bridge.

CIST REGIONAL ROOT PRIORITY - Spanning tree priority value
of the CIST regional root bridge.Note that CIST Regional Root bridge
is different from CIST Root bridge.One exception is that when a
bridge belonging to an MST region happens to be the root bridge of
the CST(Common Spanning Tree). An MST Region in the CST can be
regarded as a common RSTP bridge.The IST(Internal Spanning Tree)
and MSTIs are transparent to bridges outside this region.

CIST REGIONAL ROOT MAC - MAC Address of the CIST regional
root bridge.

CIST INTERNAL ROOT PATH COST - Root path cost value from
the point of view of the bridges inside the IST.

CIST CURRENT MAX AGE - Max Age of the CIST Root bridge.

CIST CURRENT FORWARD DELAY - Forward Delay of the CIST
Root bridge.

TIME SINCE LAST TOPOLOGY CHANGE(SECs) - Time Since Last
Topology Change is the elapsed time in unit of seconds for a bunch
of ―Topology Change and(or) Topology Change Notification
receiving‖ to occur. When new series of Topology Changes occur
again, this counter will be reset to 0.

TOPOLOGY CHANGE COUNT(SECs) - The per spanning tree
instanceTopology Change Count expresses the time spent in unit of
seconds since the beginning of the Spanning Tree Topology Change
to the end of the STP convergence. Once there is no topology
change occurring and no more topology change notification received,
the Topology Change count will be reset to 0.
Figure 4-82: Display the MSTP Port Status
P
ARAMETERS
These parameters are displayed on the MSTP Instance Status page:

Port No. – The port identity of switch physical interface. Port
number is 1 to 24.

Status - The forwarding status.Same definition as of the RSTP