User's Manual

194 Chapter 8 Setting up bridging
209322-B
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.
ForwardDelay Value (in hundredths of a second) that controls how
fast a port changes its spanning state when moving
towards the Forwarding state. The value determines
how long the port stays in each of the Listening and
Learning states, that precede the Forwarding state.
The value is also used when a topology change has
been detected and is underway. This ages all
dynamic entries in the Forwarding Database.
Note: This value is the one that this bridge is
currently using, in contrast to dot1dStpBridge
ForwardDelay which is the value that this bridge and
all others would start using if/when this bridge were
to become the root.]
BridgeMaxAge Value that all bridges use for the maximum age of a
bridge when it is acting as the root.
Note: 802.1D-1990 specifies that the range is related
to the value of BridgeHelloTime. The granularity of
this timer is specified by 802.1D-1990 to be 1
second. A badValue error may be returned if the
value set is not a whole number.
Table 77 Spanning Tree tab fields (continued)
Field Description