CIST ROOT PRIORITY:
Spanning tree priority value of the CIST root bridge
CIST ROOT MAC:
Mac Address of the CIST root bridge
CIST EXTERNAL ROOT PATH COST:
Root path cost value from the point of view of the bridge’s MST region.
CIST ROOT PORT ID:
The port ID of the bridge’s root port. In MSTP, peer port of a root port may reside in defferent MST region or 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.
