Cabletron Systems ATX, Справочное руководство

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Spanning Tree Group
ATX MIB Reference Guide 6-5
dot1dStpHoldTime {dot1dStp 10}
Integer Read-Only
This time value determines the interval length during which no more than two
Configuration bridge PDUs shall be transmitted by this node, in units of
hundredths of a second.
dot1dStpForwardDelay {dot1dStp 11}
Integer Read-Only
This time value, measured in units of hundredths of a second, controls how fast a
port changes its spanning state when moving towards the Forwarding state. The
value determines how long the port stays in a particular state before moving to
the next state. For example, how long a port stays in the Listening state when
moving from Blocking to Learning. This value is also used, when a topology
change has been detected and is underway, to age all dynamic entries in the
Forwarding Database. [Note that this value is the one that this bridge is currently
using, in contrast to dot1dStpBridgeForwardDelay which is the value that this
bridge and all others would start using if/when this bridge were to become the
root.]
dot1dStpBridgeMaxAge {dot1dStp 12}
TimeTicks Read-Write
The value that all bridges use for MaxAge when this bridge is acting as the root.
Note that 802.1d/D9 specifies that the range for this parameter is related to the
value of dot1dStpBridgeHelloTime. The granularity of this timer is specified by
802.1d/D9 to be 1 second. An agent may return a badValue error if a set is
attempted to a value which is not a whole number of seconds.
The Max Age Time must be at least 6 seconds, and must adhere to the following
equations involving Max Age Time, Forward Delay Time, and Hello Time
2 x (Forward Delay Time - 1) >= Max Age Time
Max Age >= 2 x (Hello Time + 1)
dot1dStpBridgeHelloTime {dot1dStp 13}
TimeTicks Read-Write
The value that all bridges use for HelloTime when this bridge is acting as the
root. The granularity of this timer is specified by 802.1d/D9 to be 1 second. An
agent may return a badValue error if a set is attempted to a value which is not a
whole number of seconds.
The Hello Time must adhere to the equation described in the variable
dot1dStpBridgeMaxAge, involving Max Age Time and Hello Time.