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RS400 163 ROS™ v3.5
Root Port
Synopsis: 0 to 65535 or { <empty string>}
If the bridge is designated, this is the port that provides connectivity towards the root bridge of
the network.
Root Path Cost
Synopsis: 0 to 4294967295
Total cost of the path to the root bridge composed of the sum of the costs of each link in the
path. If custom costs have not been configured. 1Gbps ports will contribute 4, 100 Mbps ports
will contribute 19 and 10 Mbps ports will contribute a cost of 100 to this figure.
For the CIST instance of MSTP, this is an external root path cost, which is the cost of the path
from the IST root (i.e. regional root) bridge to the CST root (i.e. network "global" root) bridge.
Total Topology Changes
Synopsis: 0 to 65535
A count of topology changes in the network, as detected on this bridge through link failures or
as signaled from other bridges. Excessively high or rapidly increasing counts signal network
problems.
5.5.4 Port MSTI Statistics
Figure 111: Port MSTI Statistics Table