User manual

(Rapid) Spanning Tree
6874_en_09 PHOENIX CONTACT 5-17
dimensioned using IEEE standard default values so that a topology with a maximum
of ten active Spanning Tree components always results in a stable network. When
using large tree, please note the following (see also "Large Tree Support" on
page 5-5):
– In the large tree support RSTP topology, do not use devices that do not support
large tree support.
– Enable the large tree support option on all devices.
– If RSTP is to be activated as the redundancy mechanism in an existing network
with more than seven switches along the relevant path, then the large tree support
option must first be enabled on all devices.
– It is recommended that large tree support is not activated in networks with less
than seven switches along the relevant path.