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Page 7-7
▲ Important: The lower the number, the
more likely it is that the switch will be the
Root Bridge. See Table 7-1 on page 7-5 for
more information.
4
Press Return.
The switch priority is changed.
Configuring Timers
The Spanning Tree timers — Maximum Age, Hello Time,
and Forward Delay — determine the operation of the entire
network because they control the way the IntraSwitch
interacts with other switches and bridges.
Before changing any of these timers’ values, review the
following section on timer relationships:
Timer Relationships
The timer values are related to each other, as expressed by
the following formula (where the time unit is in seconds):
2 x (Forward Delay — 1)≥ MaxAge ≥ 2 x (Hello Time +1)
This means the following:
The value of the Maximum Age timer must not
be more than twice the value of the Forward
Delay timer.
The value of the Maximum Age timer must be at
least twice the value of the Hello timer.
Increasing the length of these timers makes the
switch less sensitive and more stable. When
links or entire switches change states between
forwarding and non-forwarding states, this
affects the topology of the entire network.
6216M Book Page 7 Wednesday, January 27, 1999 5:26 PM