User manual

FL SWITCH LM
4-8
PHOENIX CONTACT 7278_en_01
4.2.1.4 Enabling via Serial Interface
Establish a connection to the switch as described in "Management via Local V.24 (RS-232)
Communication Interface" on page 3-52. Set "Spanning Tree, Enabled" on the following
page in the "Redundancy" field and select "Save".
Figure 4-7 Activating Spanning Tree
4.2.1.5 Connecting the Switches to Form a Meshed Topology
Having activated (Rapid) Spanning Tree for all switches, you can create a meshed
topology with redundant data paths. Any data connections can now be created without
taking loops into consideration. Loops can even be added on purpose in order to create
redundant connections.
A data path between Spanning Tree switches can be:
– A direct connection.
– A connection via one or more additional switches that do not support Spanning Tree.
– A connection via one or more additional hubs that do not support Spanning Tree.
Furthermore, a data path can also consist of a connection of a Spanning Tree switch to:
– A termination device.
– A network segment in which no loops may occur, which consists of several
infrastructure components (hubs or switches) without Spanning Tree support.
For the first three scenarios, the following rules must be observed:
If Spanning Tree is not supported by all of the switches used, the reconfiguration time for
Spanning Tree is extended by the aging time of switches without Spanning Tree support.