Chapter 12 Statistics Screens
Management Switch Card User’s Guide
471
Figure 313 MSTP Statistics: CIST
The following table describes the labels in this screen.
Table 230 MSTP Statistics: CIST
LABEL DESCRIPTION
Enable This field displays whether MSTP is activated on the device.
BridgeID This is the unique identifier for this bridge, consisting of bridge priority plus MAC
address. This ID is the same in ExtRootID if this device is the root switch.
TimeSinceTopoChange This is the time since the spanning tree was last reconfigured.
TopoChangeCount This is the number of times the spanning tree has been reconfigured.
TopoIsChanging The spanning tree is currently reconfiguring if “True” displays.
ExtRootPortID This is the unique identifier for the port that connects to the external root bridge.
ExtRootID This is the unique identifier for the external root bridge, consisting of bridge priority
plus MAC address.
ExtRootPathCost This is the path cost of the link to the root bridge.
ExtRootMaxAge This is the maximum time (in seconds) the spanning tree can wait without receiving
a configuration message before attempting to reconfigure on the root port.
ExtRootHelloTime This is the time interval (in seconds) at which the root transmits a configuration
message through the root port. The root bridge determines the Hello Time, Max Age
and Forward Delay.
ExtRootForwardDelay This is the time (in seconds) the root bridge will wait before changing states (that is,
listening to learning or learning to forwarding) on the root port. Each change in
states requires the forward delay time before the change.
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