Water System User Manual

114 Chapter 6 Setting up bridging
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Table 43 describes the Spanning Tree tab fields.
Table 43 Spanning Tree tab fields
Field Description
ProtocolSpecification Version of the spanning tree protocol being run. Values
include:
• decLb100: Indicates the DEC LANbridge 100
spanning tree protocol.
• ieee8021d: IEEE 802.1d implementations will return
this entry. When future versions of the IEEE spanning
tree protocol are released that are incompatible with
the current version, a new value will be defined.
Priority Value of the writable portion of the bridge ID. That is, the
first two octets of the (8-octet long) bridge ID. The last six
octets of the bridge ID are given by the value of
BridgeAddress.
TimeSinceTopologyChange Time (in hundredths of a second) since the last time a
topology change was detected by the bridge entity.
TopChanges Number of topology changes detected by this bridge
since the management entity was reset or initialized.
DesignatedRoot Bridge ID of the root of the spanning tree as determined
by the Spanning Tree Protocol. This is executed by the
node. This value is used as the Root ID parameter in all
configuration bridge PDUs originated by the node.
RootCost Cost of the path to the root as seen from this bridge.
RootPort Port number of the port that offers the lowest cost path
from this bridge to the root bridge.
MaxAge Maximum age of Spanning Tree Protocol information
learned from the network on any port before it is
discarded, in units of hundredths of a second. This is the
actual value that this bridge is currently using.
HelloTime Time between the transmission of Configuration bridge
PDUs by the node on any port when it is the root of the
spanning tree (in units of hundredths of a second). This is
the actual value that the bridge is currently using.