362 Rockwell Automation Publication 1783-UM007G-EN-P - February 2017
Chapter 7 Configure Switch Features
Spanning Tree Protocol (STP) modes include the following:
• Multiple Spanning Tree (MST) prevents network loops by enabling
only one active path for traffic. MST also provides a redundant path if
the active path becomes unavailable. This is the default STP mode. If
you connect the switch to a Cisco network switch, the typical default is
PVST+, not MST. To provide compatibility, one or the other switch
must be modified.
• Per VLAN Spanning Tree Plus (PVST+) runs on each VLAN on the
switch up to the maximum supported to prevent network loops.
• Rapid Per VLAN Spanning Tree Plus (RPVST+) immediately deletes
dynamically learned MAC address entries upon receiving a topology
change. By contrast, PVST+ uses a short aging time for dynamically
learned MAC addresses.
We recommend that you leave STP enabled to prevent network loops and
provide a redundant path if the active path becomes unavailable.
Configure STP via Device Manager
From the Configure menu, choose STP Settings.
Global Settings
To choose the STP mode for the switch or to configure STP on individual
VLANs, click the Global tab. On the Global tab, you can add, edit, or delete
instances. If you choose PVST+ or Rapid PVST+ mode, you can enable or
disable STP on each instance.
IMPORTANT Disabling STP can affect connectivity to the network.
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