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PHOENIX CONTACT 7278_en_04
4.2.4.5 Modifying the protocol timers
It may be necessary to modify the protocol timers if, e.g., there are more than ten active
Rapid Spanning Tree components in a single network. You can also attempt to reduce the
reconfiguration times by modifying the timers. However, care should be taken in order to
prevent unstable networks.
Please note that the protocol times are specified by the root switch and that they are
distributed to all devices via BPDU. It is therefore only necessary to modify the values in the
root switch. If the root switch fails, the timer values of another active RSTP switch (i.e., the
new root switch) will be valid for the entire network segment. Please remember this during
component configuration.
Specifying the timer values
– Maximum number of active Rapid Spanning Tree components along the path
beginning at the root switch (please refer to the following two example illustrations):
= (MaxAge/2) - Hello Time + 1
– 2 x Forward Delay - 1 s ≥ MaxAge
–MaxAge ≥ 2 × Hello Time + 1 s
The value ((MaxAge/2) - Hello Time) for a ring topology corresponds to the maximum
number of components with active Rapid Spanning Tree.
NOTE: Modifying the protocol timers may result in unstable networks.
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